gh-148395: Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor - #148396
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Thank you for fixing this!
picnixz
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{LZMA, BZ2, _Zlib}Decompressor
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gpshead
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needs backport to 3.13
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Thanks @StanFromIreland for the PR, and @gpshead for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13. |
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Thanks @StanFromIreland for the PR, and @gpshead for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14. |
miss-islington
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Apr 13, 2026
…pythonGH-148396) Fix dangling input pointer after `MemoryError` in _lzma/_bz2/_ZlibDecompressor.decompress (cherry picked from commit 8fc66ae) Co-authored-by: Stan Ulbrych <stan@python.org>
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GH-148479 is a backport of this pull request to the 3.13 branch. |
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Apr 13, 2026
…pythonGH-148396) Fix dangling input pointer after `MemoryError` in _lzma/_bz2/_ZlibDecompressor.decompress (cherry picked from commit 8fc66ae) Co-authored-by: Stan Ulbrych <stan@python.org>
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GH-148480 is a backport of this pull request to the 3.14 branch. |
camachat
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Fix critical use-after-free bug in LZMA/BZ2/ZLib decompressor routines when reusing decompressor instances after a MemoryError was raised from one. While here: - fix DEBUG build/package (several %%ABI%% were in the wrong place in pkg-plist that caused failed installs) - switch to using system textproc/expat2 library - issue warnings in pre-test that IPV6, PYMALLOC are required and DEBUG also breaks one self-test - bump PORTREVISION - drop LTOFULL again and make LTO use =full References: https://mail.python.org/archives/list/security-announce@python.org/thread/HTWB2Z6KT5QQX4RYEZAFININDHNOSIF3 https://www.cve.org/CVERecord?id=CVE-2026-6100 python/cpython#148396 Obtained from: GitHub repo python/cpython@c8d8173 Security: CVE-2026-6100 b8e9f33c-375d-11f1-a119-e36228bfe7d4
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{LZMA,BZ2,_Zlib}Decompressor#148395