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CVE-2026-115557critical9.4

Distrust compromised intermediate certificates in ssl module

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.

Source excerpt · PSF

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Python Software Foundation · CPython

Other versions: unaffected

Version / rangeSource status
0 to before 3.11.18affected
3.12.0 to before 3.12.16affected
3.13.0 to before 3.13.18affected
3.14.0 to before 3.14.10affected
3.15.0 to before 3.15.2affected
3.16.0a1 to before 3.16.0affected
PSF version evidence

Original source 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.

References