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9.4 Critical

CVE-2026-115557 Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without…

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 and versions

Product Affected versions Fixed in
CPython 3.16 3.16.0a1 → < 3.16.0 3.16.0
CPython 3.15 3.15.0 → < 3.15.2 3.15.2
CPython 3.14 3.14.0 → < 3.14.10 3.14.10
CPython 3.13 3.13.0 → < 3.13.18 3.13.18
CPython 3.12 3.12.0 → < 3.12.16 3.12.16
CPython 3.11 earliest → < 3.11.18 3.11.18

References

Timeline

  1. Published
  2. Last modified

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