Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Python Software Foundation CPython
Default version status: unaffected
0 to < 3.11.18affected3.12.0 to < 3.12.16affected3.13.0 to < 3.13.18affected3.14.0 to < 3.14.10affected3.15.0 to < 3.15.2affected3.16.0a1 to < 3.16.0affected
References
- http://www.openwall.com/lists/oss-security/2026/10/20/29 ↗
- https://github.com/python/cpython/pull/160042 ↗
- https://github.com/python/cpython/issues/160040 ↗
- https://emudhra.we-have-a-problem.com/ ↗
- https://mail.python.org/archives/list/security-announce@python.org/thread/FNAJMZV6XQYLVPABNINDMF3VF66AYLW4/ ↗
- 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 ↗
- http://www.openwall.com/lists/oss-security/2026/10/24/5 ↗