CRITICAL 9.4 NVD
CVE-2026-115557
Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known c
Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.
References
- http://www.openwall.com/lists/oss-security/2026/10/20/29
- https://emudhra.we-have-a-problem.com/
- https://github.com/python/cpython/issues/160040
- https://github.com/python/cpython/pull/160042
- https://mail.python.org/archives/list/security-announce@python.org/thread/FNAJMZV6XQYLVPAB
This critical severity vulnerability with a CVSS score of 9.4 was published on 2026-10-24 via NVD.
Risk Timeline
CVE Disclosed2026-10-24 · -1 days ago
Remediation Resources
Official Advisory
www.openwall.com/lists/oss-security/2026/10/20/29Analysis & PoC
emudhra.we-have-a-problem.com/
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