Fix Hash-collision denial-of-service vulnerabilities #796
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Description
This PR fixes a security vulnerability in
external/sundown/Project/sundown/markdown.cthat was cloned from snudown but did not receive the security patch. The original issue was reported and fixed under reddit/snudown@1ac2c13.This PR applies the same patch to eliminate the vulnerability.
References
https://nvd.nist.gov/vuln/detail/CVE-2021-41168
reddit/snudown@1ac2c13