[3.14] gh-148395: Fix a possible UAF in {LZMA,BZ2,_Zlib}Decompressor (GH-148396)#148480
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…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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- **CVE-2026-6100** (Critical, CVSS 9.1) — Use-after-free in `lzma.LZMADecompressor`, `bz2.BZ2Decompressor`, and `gzip.GzipFile` when a decompressor instance is re-used after MemoryError. Cherry-pick of commit `6a5f79c8` from the 3.14 branch. - GHSA: GHSA-pg25-7cx5-cvcm - Upstream: python/cpython#148480 - **CVE-2026-1502** (Medium) — CR/LF bytes not rejected in HTTP client proxy tunnel headers. Cherry-pick of commit `b1cf9016` from the 3.14 branch. - GHSA: GHSA-hjxq-7w9q-2jw6 - Upstream: python/cpython#148342 - **CVE-2026-4786** (High) — Incomplete mitigation of CVE-2026-4519; `%action` substitution bypass of dash-prefix check in `webbrowser`. Cherry-pick of commit `d22922c8` from main (3.14 backport PR #148516 is open and mergeable; identical file changes verified). - GHSA: GHSA-cccx-m78h-m3xw - Upstream: python/cpython#148170 Signed-off-by: Brian Carey <brian.carey@chainguard.dev> Export: edefd2a320a9e3d0ed5d7eb99a5b6f5c35bcb7fc
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Fix dangling input pointer after
MemoryErrorin _lzma/_bz2/_ZlibDecompressor.decompress(cherry picked from commit 8fc66ae)
Co-authored-by: Stan Ulbrych stan@python.org
{LZMA,BZ2,_Zlib}Decompressor#148395