CVE-2026-115557

Impact

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.

Affected packages

This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.

Weakness classification

References

• NVD record
• CVE.org record
• http://www.openwall.com/lists/oss-security/2026/10/20/29
• https://emudhra.we-have-a-problem.com/
• https://github.com/python/cpython/commit/21a50891ab4be2e9955239e625ae2b40c6b1854d
• https://github.com/python/cpython/commit/36cd295f32fc9ba19399e01abee91231440a41dd
• https://github.com/python/cpython/commit/48d9b2712cd52206c7a5882d0fdca4863ed65e93
• https://github.com/python/cpython/commit/7dd8b4736a1419750b94a388e6d158be15836fe6
• https://github.com/python/cpython/commit/98f0e4ed349f370dc8a00366da1a9797e11c9ed5
• https://github.com/python/cpython/commit/a17d9ef549008133eadf20689b1f4787902efe5b
• https://github.com/python/cpython/commit/af52b41afa4330fb38583db553631baa2f122f90
• https://github.com/python/cpython/commit/c7fd7edf7e0d122a3973cf676fae21b6aaa650a8
• https://github.com/python/cpython/commit/e2a9dd97ef9571c710ac0afaa834c8879aebce78
• https://github.com/python/cpython/commit/e4500d8a437ee5b988a5410cb9b59d177aa01370
• https://github.com/python/cpython/commit/e4f63e65a93cf44c14274aa987e644b8c003625e
• https://github.com/python/cpython/commit/e9bf2cf84eebf838a1edaa1c648c2b36345b99d3
• 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/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/
• http://www.openwall.com/lists/oss-security/2026/10/24/5