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Title: [3.10] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139532 · python/cpython · GitHub

Open Graph Title: [3.10] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139532 · python/cpython

X Title: [3.10] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139532 · python/cpython

Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available on Expat parsers, that is, parsers created by xml.parsers.expat.ParserCreate(), as: parser.SetAllocTrackerActivationThreshold(threshold), and parser.SetAllocTrackerMaximumAmplification(max_factor). (cherry picked from commits f04bea4 and 68a1778) CC @picnixz Issue: gh-90949

Open Graph Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available...

X Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available...

Opengraph URL: https://github.com/python/cpython/pull/139532

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[3.10] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) https://github.com/python/cpython/pull/139532/files#top
Show all changes 9 commits https://github.com/python/cpython/pull/139532/files
de690f1 gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-5… picnixz Sep 26, 2025 https://github.com/python/cpython/pull/139532/commits/de690f1e45672dfbf648695d15d775bf073c5155
6ae7665 gh-90949: amend GH-139234 in prevision of future mitigation API (#139… picnixz Sep 26, 2025 https://github.com/python/cpython/pull/139532/commits/6ae7665443dca42055ecbe5a9e45bcc3cac8fef2
a6a31cf Workaround lack of _Py_ID in CPython 3.10.x hartwork Oct 2, 2025 https://github.com/python/cpython/pull/139532/commits/a6a31cfd8195fb1a696bc471271a88078c55b953
98cb5cd Add temporary workaround for issue 139400 hartwork Oct 2, 2025 https://github.com/python/cpython/pull/139532/commits/98cb5cdc984f0dd19ed287e80b9ca7b1944ae7c6
d1da6d6 Migrate py_id_code into pyexpat_state hartwork Oct 3, 2025 https://github.com/python/cpython/pull/139532/commits/d1da6d6d2badfdbad4c1aa64dcda0ac603804f0d
21bdc0d Revert introduction of stddef.h import hartwork Oct 3, 2025 https://github.com/python/cpython/pull/139532/commits/21bdc0db66c4c1dd5b7309ada6e06c8d7d29373e
0049b51 Merge remote-tracking branch 'upstream/3.10' into backport-f04bea4-3.10 hartwork Oct 7, 2025 https://github.com/python/cpython/pull/139532/commits/0049b51d538f5efc1639ee4872d40cf1725d2904
8027b28 Drop workaround for 139400 as no-longer-needed hartwork Oct 7, 2025 https://github.com/python/cpython/pull/139532/commits/8027b28dabec7cc61b7a1e43367c41b7db55eac9
7499b90 Merge remote-tracking branch 'upstream/3.10' into backport-f04bea4-3.10 hartwork Nov 2, 2025 https://github.com/python/cpython/pull/139532/commits/7499b9087caec0dfbb71a17d1c4ef4d61cd9f7c9
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