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Vulnerabilities of Python Software Foundation CPython

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CVE Summary Score Published
CVE-2026-115557 Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without… 9.4 Critical Oct 24, 2026
CVE-2026-19445 A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callback assigns… 9.2 Critical Sep 30, 2026
CVE-2026-6100 Use-after-free (UAF) was possible in the `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a… 9.1 Critical Apr 13, 2026
CVE-2025-4517 Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data" 9.4 Critical Jun 3, 2025

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