chore(deps): update dependency urllib3 to v2 [security] #252

renovate · 2025-06-19T10:07:05Z

Note

Mend has cancelled the proposed renaming of the Renovate GitHub app being renamed to mend[bot].

This notice will be removed on 2025-10-07.

This PR contains the following updates:

Package	Change	Age	Confidence
urllib3 (changelog)	`>=1.24,<1.25` -> `>=2.5.0,<2.6`

GitHub Vulnerability Alerts

CVE-2020-26137

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.

CVE-2023-43804

urllib3 doesn't treat the Cookie HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a Cookie header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly.

Users must handle redirects themselves instead of relying on urllib3's automatic redirects to achieve safe processing of the Cookie header, thus we decided to strip the header by default in order to further protect users who aren't using the correct approach.

Affected usages

We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:

Using an affected version of urllib3 (patched in v1.26.17 and v2.0.6)
Using the Cookie header on requests, which is mostly typical for impersonating a browser.
Not disabling HTTP redirects
Either not using HTTPS or for the origin server to redirect to a malicious origin.

Remediation

Upgrading to at least urllib3 v1.26.17 or v2.0.6
Disabling HTTP redirects using redirects=False when sending requests.
Not using the Cookie header.

CVE-2023-45803

urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 303 "See Other" after the request had its method changed from one that could accept a request body (like POST) to GET as is required by HTTP RFCs. Although the behavior of removing the request body is not specified in the section for redirects, it can be inferred by piecing together information from different sections and we have observed the behavior in other major HTTP client implementations like curl and web browsers.

From RFC 9110 Section 9.3.1:

A client SHOULD NOT generate content in a GET request unless it is made directly to an origin server that has previously indicated, in or out of band, that such a request has a purpose and will be adequately supported.

Affected usages

Because the vulnerability requires a previously trusted service to become compromised in order to have an impact on confidentiality we believe the exploitability of this vulnerability is low. Additionally, many users aren't putting sensitive data in HTTP request bodies, if this is the case then this vulnerability isn't exploitable.

Both of the following conditions must be true to be affected by this vulnerability:

If you're using urllib3 and submitting sensitive information in the HTTP request body (such as form data or JSON)
The origin service is compromised and starts redirecting using 303 to a malicious peer or the redirected-to service becomes compromised.

Remediation

You can remediate this vulnerability with any of the following steps:

Upgrade to a patched version of urllib3 (v1.26.18 or v2.0.7)
Disable redirects for services that you aren't expecting to respond with redirects with redirects=False.
Disable automatic redirects with redirects=False and handle 303 redirects manually by stripping the HTTP request body.

CVE-2024-37891

When using urllib3's proxy support with ProxyManager, the Proxy-Authorization header is only sent to the configured proxy, as expected.

However, when sending HTTP requests without using urllib3's proxy support, it's possible to accidentally configure the Proxy-Authorization header even though it won't have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn't treat the Proxy-Authorization HTTP header as one carrying authentication material and thus doesn't strip the header on cross-origin redirects.

Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the Proxy-Authorization header during cross-origin redirects to avoid the small chance that users are doing this on accident.

Users should use urllib3's proxy support or disable automatic redirects to achieve safe processing of the Proxy-Authorization header, but we still decided to strip the header by default in order to further protect users who aren't using the correct approach.

Affected usages

We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:

Setting the Proxy-Authorization header without using urllib3's built-in proxy support.
Not disabling HTTP redirects.
Either not using an HTTPS origin server or for the proxy or target origin to redirect to a malicious origin.

Remediation

Using the Proxy-Authorization header with urllib3's ProxyManager.
Disabling HTTP redirects using redirects=False when sending requests.
Not using the Proxy-Authorization header.

CVE-2025-50181

urllib3 handles redirects and retries using the same mechanism, which is controlled by the Retry object. The most common way to disable redirects is at the request level, as follows:

resp = urllib3.request("GET", "https://httpbin.org/redirect/1", redirect=False)
print(resp.status)

# 302

However, it is also possible to disable redirects, for all requests, by instantiating a PoolManager and specifying retries in a way that disable redirects:

import urllib3

http = urllib3.PoolManager(retries=0)  # should raise MaxRetryError on redirect
http = urllib3.PoolManager(retries=urllib3.Retry(redirect=0))  # equivalent to the above
http = urllib3.PoolManager(retries=False)  # should return the first response

resp = http.request("GET", "https://httpbin.org/redirect/1")

However, the retries parameter is currently ignored, which means all the above examples don't disable redirects.

Affected usages

Passing retries on PoolManager instantiation to disable redirects or restrict their number.

By default, requests and botocore users are not affected.

Impact

Redirects are often used to exploit SSRF vulnerabilities. An application attempting to mitigate SSRF or open redirect vulnerabilities by disabling redirects at the PoolManager level will remain vulnerable.

Remediation

You can remediate this vulnerability with the following steps:

Upgrade to a patched version of urllib3. If your organization would benefit from the continued support of urllib3 1.x, please contact sethmichaellarson@gmail.com to discuss sponsorship or contribution opportunities.
Disable redirects at the request() level instead of the PoolManager() level.

Release Notes

urllib3/urllib3 (urllib3)

`v2.5.0`

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Features

Added support for the compression.zstd module that is new in Python 3.14.
See PEP 784 <https://peps.python.org/pep-0784/>_ for more information. (#3610 <https://github.com/urllib3/urllib3/issues/3610>__)
Added support for version 0.5 of hatch-vcs (#3612 <https://github.com/urllib3/urllib3/issues/3612>__)

Bugfixes

Fixed a security issue where restricting the maximum number of followed
redirects at the urllib3.PoolManager level via the retries parameter
did not work.
Made the Node.js runtime respect redirect parameters such as retries
and redirects.
Raised exception for HTTPResponse.shutdown on a connection already released to the pool. (#3581 <https://github.com/urllib3/urllib3/issues/3581>__)
Fixed incorrect CONNECT statement when using an IPv6 proxy with connection_from_host. Previously would not be wrapped in []. (#3615 <https://github.com/urllib3/urllib3/issues/3615>__)

`v2.4.0`

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Features

Applied PEP 639 by specifying the license fields in pyproject.toml. (#3522 <https://github.com/urllib3/urllib3/issues/3522>__)
Updated exceptions to save and restore more properties during the pickle/serialization process. (#3567 <https://github.com/urllib3/urllib3/issues/3567>__)
Added verify_flags option to create_urllib3_context with a default of VERIFY_X509_PARTIAL_CHAIN and VERIFY_X509_STRICT for Python 3.13+. (#3571 <https://github.com/urllib3/urllib3/issues/3571>__)

Bugfixes

Fixed a bug with partial reads of streaming data in Emscripten. (#3555 <https://github.com/urllib3/urllib3/issues/3555>__)

Misc

Switched to uv for installing development dependecies. (#3550 <https://github.com/urllib3/urllib3/issues/3550>__)
Removed the multiple.intoto.jsonl asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. (#3566 <https://github.com/urllib3/urllib3/issues/3566>__)

`v2.3.0`

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Features

Applied PEP 639 by specifying the license fields in pyproject.toml. (#3522 <https://github.com/urllib3/urllib3/issues/3522>__)
Updated exceptions to save and restore more properties during the pickle/serialization process. (#3567 <https://github.com/urllib3/urllib3/issues/3567>__)
Added verify_flags option to create_urllib3_context with a default of VERIFY_X509_PARTIAL_CHAIN and VERIFY_X509_STRICT for Python 3.13+. (#3571 <https://github.com/urllib3/urllib3/issues/3571>__)

Bugfixes

Fixed a bug with partial reads of streaming data in Emscripten. (#3555 <https://github.com/urllib3/urllib3/issues/3555>__)

Misc

Switched to uv for installing development dependecies. (#3550 <https://github.com/urllib3/urllib3/issues/3550>__)
Removed the multiple.intoto.jsonl asset from GitHub releases. Attestation of release files since v2.3.0 can be found on PyPI. (#3566 <https://github.com/urllib3/urllib3/issues/3566>__)

`v2.2.3`

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Features

Added support for Python 3.13. (#3473 <https://github.com/urllib3/urllib3/issues/3473>__)

Bugfixes

Fixed the default encoding of chunked request bodies to be UTF-8 instead of ISO-8859-1.
All other methods of supplying a request body already use UTF-8 starting in urllib3 v2.0. (#3053 <https://github.com/urllib3/urllib3/issues/3053>__)
Fixed ResourceWarning on CONNECT with Python < 3.11.4 by backporting python/cpython#103472. (#3252 <https://github.com/urllib3/urllib3/issues/3252>__)
Adjust tolerance for floating-point comparison on Windows to avoid flakiness in CI (#3413 <https://github.com/urllib3/urllib3/issues/3413>__)
Fixed a crash where certain standard library hash functions were absent in restricted environments. (#3432 <https://github.com/urllib3/urllib3/issues/3432>__)
Fixed mypy error when adding to HTTPConnection.default_socket_options. (#3448 <https://github.com/urllib3/urllib3/issues/3448>__)

HTTP/2 (experimental)

HTTP/2 support is still in early development.

Excluded Transfer-Encoding: chunked from HTTP/2 request body (#3425 <https://github.com/urllib3/urllib3/issues/3425>__)
Added version checking for h2 (https://pypi.org/project/h2/) usage.

Now only accepting supported h2 major version 4.x.x. (#3290 <https://github.com/urllib3/urllib3/issues/3290>__)
Added a probing mechanism for determining whether a given target origin
supports HTTP/2 via ALPN. (#3301 <https://github.com/urllib3/urllib3/issues/3301>__)
Add support for sending a request body with HTTP/2 (#3302 <https://github.com/urllib3/urllib3/issues/3302>__)

Deprecations and Removals

Note for downstream distributors: the _version.py file has been removed and is now created at build time by hatch-vcs. (#3412 <https://github.com/urllib3/urllib3/issues/3412>__)
Drop support for end-of-life PyPy3.8 and PyPy3.9. (#3475 <https://github.com/urllib3/urllib3/issues/3475>__)

`v2.2.2`

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Added the Proxy-Authorization header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via Retry.remove_headers_on_redirect.
Allowed passing negative integers as amt to read methods of http.client.HTTPResponse as an alternative to None. (#3122 <https://github.com/urllib3/urllib3/issues/3122>__)
Fixed return types representing copying actions to use typing.Self. (#3363 <https://github.com/urllib3/urllib3/issues/3363>__)

`v2.2.1`

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Fixed issue where InsecureRequestWarning was emitted for HTTPS connections when using Emscripten. (#3331 <https://github.com/urllib3/urllib3/issues/3331>__)
Fixed HTTPConnectionPool.urlopen to stop automatically casting non-proxy headers to HTTPHeaderDict. This change was premature as it did not apply to proxy headers and HTTPHeaderDict does not handle byte header values correctly yet. (#3343 <https://github.com/urllib3/urllib3/issues/3343>__)
Changed InvalidChunkLength to ProtocolError when response terminates before the chunk length is sent. (#2860 <https://github.com/urllib3/urllib3/issues/2860>__)
Changed ProtocolError to be more verbose on incomplete reads with excess content. (#3261 <https://github.com/urllib3/urllib3/issues/3261>__)

`v2.2.0`

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Added support for Emscripten and Pyodide <https://urllib3.readthedocs.io/en/latest/reference/contrib/emscripten.html>, including streaming support in cross-origin isolated browser environments where threading is enabled. (#2951 <https://github.com/urllib3/urllib3/issues/2951>)
Added support for HTTPResponse.read1() method. (#3186 <https://github.com/urllib3/urllib3/issues/3186>__)
Added rudimentary support for HTTP/2. (#3284 <https://github.com/urllib3/urllib3/issues/3284>__)
Fixed issue where requests against urls with trailing dots were failing due to SSL errors
when using proxy. (#2244 <https://github.com/urllib3/urllib3/issues/2244>__)
Fixed HTTPConnection.proxy_is_verified and HTTPSConnection.proxy_is_verified
to be always set to a boolean after connecting to a proxy. It could be
None in some cases previously. (#3130 <https://github.com/urllib3/urllib3/issues/3130>__)
Fixed an issue where headers passed in a request with json= would be mutated (#3203 <https://github.com/urllib3/urllib3/issues/3203>__)
Fixed HTTPSConnection.is_verified to be set to False when connecting
from a HTTPS proxy to an HTTP target. It was set to True previously. (#3267 <https://github.com/urllib3/urllib3/issues/3267>__)
Fixed handling of new error message from OpenSSL 3.2.0 when configuring an HTTP proxy as HTTPS (#3268 <https://github.com/urllib3/urllib3/issues/3268>__)
Fixed TLS 1.3 post-handshake auth when the server certificate validation is disabled (#3325 <https://github.com/urllib3/urllib3/issues/3325>__)
Note for downstream distributors: To run integration tests, you now need to run the tests a second
time with the --integration pytest flag. (#3181 <https://github.com/urllib3/urllib3/issues/3181>__)

`v2.1.0`

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Removed support for the deprecated urllib3[secure] extra. (#2680 <https://github.com/urllib3/urllib3/issues/2680>__)
Removed support for the deprecated SecureTransport TLS implementation. (#2681 <https://github.com/urllib3/urllib3/issues/2681>__)
Removed support for the end-of-life Python 3.7. (#3143 <https://github.com/urllib3/urllib3/issues/3143>__)
Allowed loading CA certificates from memory for proxies. (#3065 <https://github.com/urllib3/urllib3/issues/3065>__)
Fixed decoding Gzip-encoded responses which specified x-gzip content-encoding. (#3174 <https://github.com/urllib3/urllib3/issues/3174>__)

`v2.0.7`

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Made body stripped from HTTP requests changing the request method to GET after HTTP 303 "See Other" redirect responses.

`v2.0.6`

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Added the Cookie header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via Retry.remove_headers_on_redirect.

`v2.0.5`

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Allowed pyOpenSSL third-party module without any deprecation warning. (#3126 <https://github.com/urllib3/urllib3/issues/3126>__)
Fixed default blocksize of HTTPConnection classes to match high-level classes. Previously was 8KiB, now 16KiB. (#3066 <https://github.com/urllib3/urllib3/issues/3066>__)

`v2.0.4`

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Added support for union operators to HTTPHeaderDict (#2254 <https://github.com/urllib3/urllib3/issues/2254>__)
Added BaseHTTPResponse to urllib3.__all__ (#3078 <https://github.com/urllib3/urllib3/issues/3078>__)
Fixed urllib3.connection.HTTPConnection to raise the http.client.connect audit event to have the same behavior as the standard library HTTP client (#2757 <https://github.com/urllib3/urllib3/issues/2757>__)
Relied on the standard library for checking hostnames in supported PyPy releases (#3087 <https://github.com/urllib3/urllib3/issues/3087>__)

`v2.0.3`

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Allowed alternative SSL libraries such as LibreSSL, while still issuing a warning as we cannot help users facing issues with implementations other than OpenSSL. (#3020 <https://github.com/urllib3/urllib3/issues/3020>__)
Deprecated URLs which don't have an explicit scheme (#2950 <https://github.com/urllib3/urllib3/pull/2950>_)
Fixed response decoding with Zstandard when compressed data is made of several frames. (#3008 <https://github.com/urllib3/urllib3/issues/3008>__)
Fixed assert_hostname=False to correctly skip hostname check. (#3051 <https://github.com/urllib3/urllib3/issues/3051>__)

`v2.0.2`

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Fixed HTTPResponse.stream() to continue yielding bytes if buffered decompressed data
was still available to be read even if the underlying socket is closed. This prevents
a compressed response from being truncated. (#3009 <https://github.com/urllib3/urllib3/issues/3009>__)

`v2.0.1`

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Fixed a socket leak when fingerprint or hostname verifications fail. (#2991 <https://github.com/urllib3/urllib3/issues/2991>__)
Fixed an error when HTTPResponse.read(0) was the first read call or when the internal response body buffer was otherwise empty. (#2998 <https://github.com/urllib3/urllib3/issues/2998>__)

`v2.0.0`

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Read the v2.0 migration guide <https://urllib3.readthedocs.io/en/latest/v2-migration-guide.html>__ for help upgrading to the latest version of urllib3.

Removed

Removed support for Python 2.7, 3.5, and 3.6 (#883 <https://github.com/urllib3/urllib3/issues/883>, #2336 <https://github.com/urllib3/urllib3/issues/2336>).
Removed fallback on certificate commonName in match_hostname() function.
This behavior was deprecated in May 2000 in RFC 2818. Instead only subjectAltName
is used to verify the hostname by default. To enable verifying the hostname against
commonName use SSLContext.hostname_checks_common_name = True (#2113 <https://github.com/urllib3/urllib3/issues/2113>__).
Removed support for Python with an ssl module compiled with LibreSSL, CiscoSSL,
wolfSSL, and all other OpenSSL alternatives. Python is moving to require OpenSSL with PEP 644 (#2168 <https://github.com/urllib3/urllib3/issues/2168>__).
Removed support for OpenSSL versions earlier than 1.1.1 or that don't have SNI support.
When an incompatible OpenSSL version is detected an ImportError is raised (#2168 <https://github.com/urllib3/urllib3/issues/2168>__).
Removed the list of default ciphers for OpenSSL 1.1.1+ and SecureTransport as their own defaults are already secure (#2082 <https://github.com/urllib3/urllib3/issues/2082>__).
Removed urllib3.contrib.appengine.AppEngineManager and support for Google App Engine Standard Environment (#2044 <https://github.com/urllib3/urllib3/issues/2044>__).
Removed deprecated Retry options method_whitelist, DEFAULT_REDIRECT_HEADERS_BLACKLIST (#2086 <https://github.com/urllib3/urllib3/issues/2086>__).
Removed urllib3.HTTPResponse.from_httplib (#2648 <https://github.com/urllib3/urllib3/issues/2648>__).
Removed default value of None for the request_context parameter of urllib3.PoolManager.connection_from_pool_key. This change should have no effect on users as the default value of None was an invalid option and was never used (#1897 <https://github.com/urllib3/urllib3/issues/1897>__).
Removed the urllib3.request module. urllib3.request.RequestMethods has been made a private API.
This change was made to ensure that from urllib3 import request imported the top-level request()
function instead of the urllib3.request module (#2269 <https://github.com/urllib3/urllib3/issues/2269>__).
Removed support for SSLv3.0 from the urllib3.contrib.pyopenssl even when support is available from the compiled OpenSSL library (#2233 <https://github.com/urllib3/urllib3/issues/2233>__).
Removed the deprecated urllib3.contrib.ntlmpool module (#2339 <https://github.com/urllib3/urllib3/issues/2339>__).
Removed DEFAULT_CIPHERS, HAS_SNI, USE_DEFAULT_SSLCONTEXT_CIPHERS, from the private module urllib3.util.ssl_ (#2168 <https://github.com/urllib3/urllib3/issues/2168>__).
Removed urllib3.exceptions.SNIMissingWarning (#2168 <https://github.com/urllib3/urllib3/issues/2168>__).
Removed the _prepare_conn method from HTTPConnectionPool. Previously this was only used to call HTTPSConnection.set_cert() by HTTPSConnectionPool (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Removed tls_in_tls_required property from HTTPSConnection. This is now determined from the scheme parameter in HTTPConnection.set_tunnel() (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Removed the strict parameter/attribute from HTTPConnection, HTTPSConnection, HTTPConnectionPool, HTTPSConnectionPool, and HTTPResponse (#2064 <https://github.com/urllib3/urllib3/issues/2064>__).

Deprecated

Deprecated HTTPResponse.getheaders() and HTTPResponse.getheader() which will be removed in urllib3 v2.1.0. Instead use HTTPResponse.headers and HTTPResponse.headers.get(name, default). (#1543 <https://github.com/urllib3/urllib3/issues/1543>, #2814 <https://github.com/urllib3/urllib3/issues/2814>).
Deprecated urllib3.contrib.pyopenssl module which will be removed in urllib3 v2.1.0 (#2691 <https://github.com/urllib3/urllib3/issues/2691>__).
Deprecated urllib3.contrib.securetransport module which will be removed in urllib3 v2.1.0 (#2692 <https://github.com/urllib3/urllib3/issues/2692>__).
Deprecated ssl_version option in favor of ssl_minimum_version. ssl_version will be removed in urllib3 v2.1.0 (#2110 <https://github.com/urllib3/urllib3/issues/2110>__).
Deprecated the strict parameter of PoolManager.connection_from_context() as it's not longer needed in Python 3.x. It will be removed in urllib3 v2.1.0 (#2267 <https://github.com/urllib3/urllib3/issues/2267>__)
Deprecated the NewConnectionError.pool attribute which will be removed in urllib3 v2.1.0 (#2271 <https://github.com/urllib3/urllib3/issues/2271>__).
Deprecated format_header_param_html5 and format_header_param in favor of format_multipart_header_param (#2257 <https://github.com/urllib3/urllib3/issues/2257>__).
Deprecated RequestField.header_formatter parameter which will be removed in urllib3 v2.1.0 (#2257 <https://github.com/urllib3/urllib3/issues/2257>__).
Deprecated HTTPSConnection.set_cert() method. Instead pass parameters to the HTTPSConnection constructor (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Deprecated HTTPConnection.request_chunked() method which will be removed in urllib3 v2.1.0. Instead pass chunked=True to HTTPConnection.request() (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).

Added

Added top-level urllib3.request function which uses a preconfigured module-global PoolManager instance (#2150 <https://github.com/urllib3/urllib3/issues/2150>__).
Added the json parameter to urllib3.request(), PoolManager.request(), and ConnectionPool.request() methods to send JSON bodies in requests. Using this parameter will set the header Content-Type: application/json if Content-Type isn't already defined.
Added support for parsing JSON response bodies with HTTPResponse.json() method (#2243 <https://github.com/urllib3/urllib3/issues/2243>__).
Added type hints to the urllib3 module (#1897 <https://github.com/urllib3/urllib3/issues/1897>__).
Added ssl_minimum_version and ssl_maximum_version options which set
SSLContext.minimum_version and SSLContext.maximum_version (#2110 <https://github.com/urllib3/urllib3/issues/2110>__).
Added support for Zstandard (RFC 8878) when zstandard 1.18.0 or later is installed.
Added the zstd extra which installs the zstandard package (#1992 <https://github.com/urllib3/urllib3/issues/1992>__).
Added urllib3.response.BaseHTTPResponse class. All future response classes will be subclasses of BaseHTTPResponse (#2083 <https://github.com/urllib3/urllib3/issues/2083>__).
Added FullPoolError which is raised when PoolManager(block=True) and a connection is returned to a full pool (#2197 <https://github.com/urllib3/urllib3/issues/2197>__).
Added HTTPHeaderDict to the top-level urllib3 namespace (#2216 <https://github.com/urllib3/urllib3/issues/2216>__).
Added support for configuring header merging behavior with HTTPHeaderDict
When using a HTTPHeaderDict to provide headers for a request, by default duplicate
header values will be repeated. But if combine=True is passed into a call to
HTTPHeaderDict.add, then the added header value will be merged in with an existing
value into a comma-separated list (X-My-Header: foo, bar) (#2242 <https://github.com/urllib3/urllib3/issues/2242>__).
Added NameResolutionError exception when a DNS error occurs (#2305 <https://github.com/urllib3/urllib3/issues/2305>__).
Added proxy_assert_hostname and proxy_assert_fingerprint kwargs to ProxyManager (#2409 <https://github.com/urllib3/urllib3/issues/2409>__).
Added a configurable backoff_max parameter to the Retry class.
If a custom backoff_max is provided to the Retry class, it
will replace the Retry.DEFAULT_BACKOFF_MAX (#2494 <https://github.com/urllib3/urllib3/issues/2494>__).
Added the authority property to the Url class as per RFC 3986 3.2. This property should be used in place of netloc for users who want to include the userinfo (auth) component of the URI (#2520 <https://github.com/urllib3/urllib3/issues/2520>__).
Added the scheme parameter to HTTPConnection.set_tunnel to configure the scheme of the origin being tunnelled to (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Added the is_closed, is_connected and has_connected_to_proxy properties to HTTPConnection (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Added optional backoff_jitter parameter to Retry. (#2952 <https://github.com/urllib3/urllib3/issues/2952>__)

Changed

Changed urllib3.response.HTTPResponse.read to respect the semantics of io.BufferedIOBase regardless of compression. Specifically, this method:
- Only returns an empty bytes object to indicate EOF (that is, the response has been fully consumed).
- Never returns more bytes than requested.
- Can issue any number of system calls: zero, one or multiple.
If you want each urllib3.response.HTTPResponse.read call to issue a single system call, you need to disable decompression by setting decode_content=False (#2128 <https://github.com/urllib3/urllib3/issues/2128>__).
Changed urllib3.HTTPConnection.getresponse to return an instance of urllib3.HTTPResponse instead of http.client.HTTPResponse (#2648 <https://github.com/urllib3/urllib3/issues/2648>__).
Changed ssl_version to instead set the corresponding SSLContext.minimum_version
and SSLContext.maximum_version values. Regardless of ssl_version passed
SSLContext objects are now constructed using ssl.PROTOCOL_TLS_CLIENT (#2110 <https://github.com/urllib3/urllib3/issues/2110>__).
Changed default SSLContext.minimum_version to be TLSVersion.TLSv1_2 in line with Python 3.10 (#2373 <https://github.com/urllib3/urllib3/issues/2373>__).
Changed ProxyError to wrap any connection error (timeout, TLS, DNS) that occurs when connecting to the proxy (#2482 <https://github.com/urllib3/urllib3/pull/2482>__).
Changed urllib3.util.create_urllib3_context to not override the system cipher suites with
a default value. The new default will be cipher suites configured by the operating system (#2168 <https://github.com/urllib3/urllib3/issues/2168>__).
Changed multipart/form-data header parameter formatting matches the WHATWG HTML Standard as of 2021-06-10. Control characters in filenames are no longer percent encoded (#2257 <https://github.com/urllib3/urllib3/issues/2257>__).
Changed the error raised when connecting via HTTPS when the ssl module isn't available from SSLError to ImportError (#2589 <https://github.com/urllib3/urllib3/issues/2589>__).
Changed HTTPConnection.request() to always use lowercase chunk boundaries when sending requests with Transfer-Encoding: chunked (#2515 <https://github.com/urllib3/urllib3/issues/2515>__).
Changed enforce_content_length default to True, preventing silent data loss when reading streamed responses (#2514 <https://github.com/urllib3/urllib3/issues/2514>__).
Changed internal implementation of HTTPHeaderDict to use dict instead of collections.OrderedDict for better performance (#2080 <https://github.com/urllib3/urllib3/issues/2080>__).
Changed the urllib3.contrib.pyopenssl module to wrap OpenSSL.SSL.Error with ssl.SSLError in PyOpenSSLContext.load_cert_chain (#2628 <https://github.com/urllib3/urllib3/issues/2628>__).
Changed usage of the deprecated socket.error to OSError (#2120 <https://github.com/urllib3/urllib3/issues/2120>__).
Changed all parameters in the HTTPConnection and HTTPSConnection constructors to be keyword-only except host and port (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Changed HTTPConnection.getresponse() to set the socket timeout from HTTPConnection.timeout value before reading
data from the socket. This previously was done manually by the HTTPConnectionPool calling HTTPConnection.sock.settimeout(...) (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Changed the _proxy_host property to _tunnel_host in HTTPConnectionPool to more closely match how the property is used (value in HTTPConnection.set_tunnel()) (#1985 <https://github.com/urllib3/urllib3/issues/1985>__).
Changed name of Retry.BACK0FF_MAX to be Retry.DEFAULT_BACKOFF_MAX.
Changed TLS handshakes to use SSLContext.check_hostname when possible (#2452 <https://github.com/urllib3/urllib3/pull/2452>__).
Changed server_hostname to behave like other parameters only used by HTTPSConnectionPool (#2537 <https://github.com/urllib3/urllib3/pull/2537>__).
Changed the default blocksize to 16KB to match OpenSSL's default read amounts (#2348 <https://github.com/urllib3/urllib3/pull/2348>__).
Changed HTTPResponse.read() to raise an error when calling with decode_content=False after using decode_content=True to prevent data loss (#2800 <https://github.com/urllib3/urllib3/issues/2800>__).

Fixed

Fixed thread-safety issue where accessing a PoolManager with many distinct origins would cause connection pools to be closed while requests are in progress (#1252 <https://github.com/urllib3/urllib3/issues/1252>__).
Fixed an issue where an HTTPConnection instance would erroneously reuse the socket read timeout value from reading the previous response instead of a newly configured connect timeout.
Instead now if HTTPConnection.timeout is updated before sending the next request the new timeout value will be used (#2645 <https://github.com/urllib3/urllib3/issues/2645>__).
Fixed socket.error.errno when raised from pyOpenSSL's OpenSSL.SSL.SysCallError (#2118 <https://github.com/urllib3/urllib3/issues/2118>__).
Fixed the default value of HTTPSConnection.socket_options to match HTTPConnection (#2213 <https://github.com/urllib3/urllib3/issues/2213>__).
Fixed a bug where headers would be modified by the remove_headers_on_redirect feature (#2272 <https://github.com/urllib3/urllib3/issues/2272>__).
Fixed a reference cycle bug in urllib3.util.connection.create_connection() (#2277 <https://github.com/urllib3/urllib3/issues/2277>__).
Fixed a socket leak if HTTPConnection.connect() fails (#2571 <https://github.com/urllib3/urllib3/pull/2571>__).
Fixed urllib3.contrib.pyopenssl.WrappedSocket and urllib3.contrib.securetransport.WrappedSocket close methods (#2970 <https://github.com/urllib3/urllib3/issues/2970>__)

`v1.26.20`

Compare Source

====================

Fixed a crash where certain standard library hash functions were absent in
FIPS-compliant environments.
(#3432 <https://github.com/urllib3/urllib3/issues/3432>__)
Replaced deprecated dash-separated setuptools entries in setup.cfg.
(#3461 <https://github.com/urllib3/urllib3/pull/3461>__)
Took into account macOS setting ECONNRESET instead of EPROTOTYPE in
its newer versions.
(#3416 <https://github.com/urllib3/urllib3/pull/3416>__)
Backported changes to our tests and CI configuration from v2.x to support
testing with CPython 3.12 and 3.13.
(#3436 <https://github.com/urllib3/urllib3/pull/3436>__)

`v1.26.19`

Compare Source

====================

Added the Proxy-Authorization header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via Retry.remove_headers_on_redirect.
Fixed handling of OpenSSL 3.2.0 new error message for misconfiguring an HTTP proxy as HTTPS. (#3405 <https://github.com/urllib3/urllib3/issues/3405>__)

`v1.26.18`

Compare Source

====================

Made body stripped from HTTP requests changing the request method to GET after HTTP 303 "See Other" redirect responses.

`v1.26.17`

Compare Source

====================

Added the Cookie header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via Retry.remove_headers_on_redirect. (#3139 <https://github.com/urllib3/urllib3/pull/3139>_)

`v1.26.16`

Compare Source

====================

Fixed thread-safety issue where accessing a PoolManager with many distinct origins
would cause connection pools to be closed while requests are in progress (#2954 <https://github.com/urllib3/urllib3/pull/2954>_)

`v1.26.15`

Compare Source

====================

Fix socket timeout value when HTTPConnection is reused (#2645 <https://github.com/urllib3/urllib3/issues/2645>__)
Remove "!" character from the unreserved characters in IPv6 Zone ID parsing
(#2899 <https://github.com/urllib3/urllib3/issues/2899>__)
Fix IDNA handling of '\x80' byte (#2901 <https://github.com/urllib3/urllib3/issues/2901>__)

`v1.26.14`

Compare Source

====================

Fixed parsing of port 0 (zero) returning None, instead of 0. (#2850 <https://github.com/urllib3/urllib3/issues/2850>__)
Removed deprecated getheaders() calls in contrib module. Fixed the type hint of PoolKey.key_retries by adding bool to the union. (#2865 <https://github.com/urllib3/urllib3/issues/2865>__)

`v1.26.13`

Compare Source

====================

Deprecated the HTTPResponse.getheaders() and HTTPResponse.getheader() methods.
Fixed an issue where parsing a URL with leading zeroes in the port would be rejected
even when the port number after removing the zeroes was valid.
Fixed a deprecation warning when using cryptography v39.0.0.
Removed the <4 in the Requires-Python packaging metadata field.

`v1.26.12`

Compare Source

====================

Deprecated the urllib3[secure] extra and the urllib3.contrib.pyopenssl module.
Both will be removed in v2.x. See this GitHub issue <https://github.com/urllib3/urllib3/issues/2680>_
for justification and info on how to migrate.

`v1.26.11`

Compare Source

====================

Fixed an issue where reading more than 2 GiB in a call to HTTPResponse.read would
raise an OverflowError on Python 3.9 and earlier.

`v1.26.10`

Compare Source

====================

Removed support for Python 3.5
Fixed an issue where a ProxyError recommending configuring the proxy as HTTP
instead of HTTPS could appear even when an HTTPS proxy wasn't configured.

`v1.26.9`

Compare Source

===================

Changed urllib3[brotli] extra to favor installing Brotli libraries that are still
receiving updates like brotli and brotlicffi instead of brotlipy.
This change does not impact behavior of urllib3, only which dependencies are installed.
Fixed a socket leaking when HTTPSConnection.connect() raises an exception.
Fixed server_hostname being forwarded from PoolManager to HTTPConnectionPool
when requesting an HTTP URL. Should only be forwarded when requesting an HTTPS URL.

`v1.26.8`

Compare Source

===================

Added extra message to urllib3.exceptions.ProxyError when urllib3 detects that
a proxy is configured to use HTTPS but the proxy itself appears to only use HTTP.
Added a mention of the size of the connection pool when discarding a connection due to the pool being full.
Added explicit support for Python 3.11.
Deprecated the Retry.MAX_BACKOFF class property in favor of Retry.DEFAULT_MAX_BACKOFF
to better match the rest of the default parameter names. Retry.MAX_BACKOFF is removed in v2.0.
Changed location of the vendored ssl.match_hostname function from urllib3.packages.ssl_match_hostname
to urllib3.util.ssl_match_hostname to ensure Python 3.10+ compatibility after being repackaged
by downstream distributors.
Fixed absolute imports, all imports are now relative.

`v1.26.7`

Compare Source

===================

Fixed a bug with HTTPS hostname verification involving IP addresses and lack
of SNI. (Issue #2400)
Fixed a bug where IPv6 braces weren't stripped during certificate hostname
matching. (Issue #2240)

`v1.26.6`

Compare Source

===================

Deprecated the urllib3.contrib.ntlmpool module. urllib3 is not able to support
it properly due to reasons listed in this issue <https://github.com/urllib3/urllib3/issues/2282>_.
If you are a user of this module please leave a comment.
Changed HTTPConnection.request_chunked() to not erroneously emit multiple
Transfer-Encoding headers in the case that one is already specified.
Fixed typo in deprecation message to recommend Retry.DEFAULT_ALLOWED_METHODS.

`v1.26.5`

Compare Source

===================

Fixed deprecation warnings emitted in Python 3.10.
Updated vendored six library to 1.16.0.
Improved performance of URL parser when splitting
the authority component.

`v1.26.4`

Compare Source

===================

Changed behavior of the default SSLContext when connecting to HTTPS proxy
during HTTPS requests. The default SSLContext now sets check_hostname=True.

`v1.26.3`

Compare Source

===================

Fixed bytes and string comparison issue with headers (Pull #2141)
Changed ProxySchemeUnknown error message to be
more actionable if the user supplies a proxy URL without
a scheme. (Pull #2107)

`v1.26.2`

Compare Source

====================

Fixed a crash where certain standard library hash functions were absent in
FIPS-compliant environments.
(#3432 <https://github.com/urllib3/urllib3/issues/3432>__)
Replaced deprecated dash-separated setuptools entries in setup.cfg.
(#3461 <https://github.com/urllib3/urllib3/pull/3461>__)
Took into account macOS setting ECONNRESET instead of EPROTOTYPE in
its newer versions.
(#3416 <https://github.com/urllib3/urllib3/pull/3416>__)
Backported changes to our tests and CI configuration from v2.x to support
testing with CPython 3.12 and 3.13.
(#3436 <https://github.com/urllib3/urllib3/pull/3436>__)

`v1.26.1`

Compare Source

====================

Added the Proxy-Authorization header to the list of headers to strip from requests when redirecting to a different host. As before, different headers can be set via Retry.remove_headers_on_redirect.
Fixed handling of OpenSSL 3.2.0 new error message for misconfiguring an HTTP proxy as HTTPS. (#3405 <https://github.com/urllib3/urllib3/issues/3405>__)

`v1.26.0`

Compare Source

===================

NOTE: urllib3 v2.0 will drop support for Python 2.
Read more in the v2.0 Roadmap <https://urllib3.readthedocs.io/en/latest/v2-roadmap.html>_.
Added support for HTTPS proxies contacting HTTPS servers (Pull #1923, Pull #1806)
Deprecated negotiating TLSv1 and TLSv1.1 by default. Users that
still wish to use TLS earlier than 1.2 without a deprecation warning
should opt-in explicitly by setting ssl_version=ssl.PROTOCOL_TLSv1_1 (Pull #2002)
Starting in urllib3 v2.0: Connections that receive a DeprecationWarning will fail
Deprecated Retry options Retry.DEFAULT_METHOD_WHITELIST, Retry.DEFAULT_REDIRECT_HEADERS_BLACKLIST
and Retry(method_whitelist=...) in favor of Retry.DEFAULT_ALLOWED_METHODS,
Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT, and Retry(allowed_methods=...)
(Pull #2000) Starting in urllib3 v2.0: Deprecated options will be removed
Added default User-Agent header to every request (Pull #1750)
Added urllib3.util.SKIP_HEADER for skipping User-Agent, Accept-Encoding,
and Host headers from being automatically emitted with requests (Pull #2018)
Collapse transfer-encoding: chunked request data and framing into
the same socket.send() call (Pull #1906)
Send http/1.1 ALPN identifier with every TLS handshake by default (Pull #1894)
Properly terminate SecureTransport connections when CA verification fails (Pull #1977)
Don't emit an SNIMissingWarning when passing server_hostname=None
to SecureTransport (Pull #1903)
Disabled requesting TLSv1.2 session tickets as they weren't being used by urllib3 (Pull #1970)
Suppress BrokenPipeError when writing request body after the server
has closed the socket (Pull #1524)
Wrap ssl.SSLError that can be raised from reading a socket (e.g. "bad MAC")
into an urllib3.exceptions.SSLError (Pull #1939)

`v1.25.11`

Compare Source

====================

Fix retry backoff time parsed from Retry-After header when given
in the HTTP date format. The HTTP date was parsed as the local timezone
rather than accounting for the timezone in the HTTP date (typically
UTC) (Pull #1932, Pull #1935, Pull #1938, Pull #1949)
Fix issue where an error would be raised when the SSLKEYLOGFILE
environment variable was set to the empty string. Now SSLContext.keylog_file
is not set in this situation (Pull #2016)

`v1.25.10`

Compare Source

====================

Added support for SSLKEYLOGFILE environment variable for
logging TLS session keys with use with programs like
Wireshark for decrypting captured web traffic (Pull #1867)
Fixed loading of SecureTransport libraries on macOS Big Sur
due to the new dynamic linker cache (Pull #1905)
Collapse chunked request bodies data and framing into one
call to send() to reduce the number of TCP packets by 2-4x (Pull #1906)
Don't insert None into ConnectionPool if the pool
was empty when requesting a connection (Pull #1866)
Avoid hasattr call in BrotliDecoder.decompress() (Pull #1858)

`v1.25.9`

Compare Source

===================

Added InvalidProxyConfigurationWarning which is raised when
erroneously specifying an HTTPS proxy URL. urllib3 doesn't currently
support connecting to HTTPS proxies but will soon be able to
and we would like users to migrate properly without much breakage.

See this GitHub issue <https://github.com/urllib3/urllib3/issues/1850>_
for more information on how to fix your proxy config. (Pull #1851)
Drain connection after PoolManager redirect (Pull #1817)
Ensure load_verify_locations raises SSLError for all backends (Pull #1812)
Rename VerifiedHTTPSConnection to HTTPSConnection (Pull #1805)
Allow the CA certificate data to be passed as a string (Pull #1804)
Raise ValueError if method contains control characters (Pull #1800)
Add __repr__ to Timeout (Pull #1795)

`v1.25.8`

Compare Source

===================

Drop support for EOL Python 3.4 (Pull #1774)
Optimize _encode_invalid_chars (Pull #1787)

`v1.25.7`

Compare Source

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renovate bot force-pushed the renovate/pypi-urllib3-vulnerability branch from efed135 to 237a24b Compare September 4, 2025 12:26

renovate bot changed the title ~~chore(deps): update dependency urllib3 to v2 [security]~~ chore(deps): update dependency urllib3 to >=1.26,<1.27 [security] Sep 4, 2025

renovate bot force-pushed the renovate/pypi-urllib3-vulnerability branch from 237a24b to ee81a08 Compare September 4, 2025 16:48

renovate bot changed the title ~~chore(deps): update dependency urllib3 to >=1.26,<1.27 [security]~~ chore(deps): update dependency urllib3 to v2 [security] Sep 4, 2025

renovate bot force-pushed the renovate/pypi-urllib3-vulnerability branch from ee81a08 to 3dee754 Compare September 13, 2025 23:26

renovate bot changed the title ~~chore(deps): update dependency urllib3 to v2 [security]~~ chore(deps): update dependency urllib3 to >=1.26,<1.27 [security] Sep 13, 2025

renovate bot force-pushed the renovate/pypi-urllib3-vulnerability branch from 3dee754 to 3a23d8b Compare September 14, 2025 03:27

renovate bot changed the title ~~chore(deps): update dependency urllib3 to >=1.26,<1.27 [security]~~ chore(deps): update dependency urllib3 to v2 [security] Sep 14, 2025

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renovate bot changed the title ~~chore(deps): update dependency urllib3 to v2 [security]~~ chore(deps): update dependency urllib3 to >=1.26,<1.27 [security] Sep 25, 2025

chore(deps): update dependency urllib3 to v2 [security]

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renovate bot force-pushed the renovate/pypi-urllib3-vulnerability branch from 2efd292 to b242932 Compare September 25, 2025 20:31

renovate bot changed the title ~~chore(deps): update dependency urllib3 to >=1.26,<1.27 [security]~~ chore(deps): update dependency urllib3 to v2 [security] Sep 25, 2025

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chore(deps): update dependency urllib3 to v2 [security] #252

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renovate bot commented Jun 19, 2025 •

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