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[3.12] gh-148395: Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor (GH-148396) #148503

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Merged
Yhg1s merged 3 commits into from
Aug 4, 2026
Merged

[3.12] gh-148395: Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor (GH-148396) #148503

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e100aea
gh-148395: Fix a possible UAF in `{LZMA,BZ2,_Zlib}Decompressor` (GH-1…
StanFromIreland Apr 13, 2026
287992c
remove _ZlibDecompressor
StanFromIreland Apr 13, 2026
700cb05
revert that
StanFromIreland Apr 13, 2026
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revert that
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@StanFromIreland
StanFromIreland authored Apr 13, 2026
commit 700cb059d70fad66cfeec2230f3f111ac9cafda4
2 changes: 1 addition & 1 deletion Misc/NEWS.d/next/Security/2026-04-10-16-28-21.gh-issue-148395.kfzm0G.rst
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@@ -1,5 +1,5 @@
Fix a dangling input pointer in :class:`lzma.LZMADecompressor`,
and :class:`bz2.BZ2Decompressor`
:class:`bz2.BZ2Decompressor`, and internal :class:`!zlib._ZlibDecompressor`
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when memory allocation fails with :exc:`MemoryError`, which could let a
subsequent :meth:`!decompress` call read or write through a stale pointer to
the already-released caller buffer.
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