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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

Other CVEs of CPython

The 80 CVEs of CPython →
CVE-2026-119170 Regression in FIPS enforcement of hash algorithms affecting only Python 3.14.10 8.2 High CVE-2026-116566 socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can cause the values to be… 5.3 Medium CVE-2026-103995 Lenient parsing of integers for response body and chunk framing 2.0 Low CVE-2026-114583 tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like… 6.9 Medium
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