[3.14] gh-72680: Fix false positives when using zipfile.is_zipfile() (GH-134250)#134401
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gpshead merged 1 commit intopython:3.14from May 21, 2025
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…ythonGH-134250) bpo-28494: Improve zipfile.is_zipfile reliability The zipfile.is_zipfile function would only search for the EndOfZipfile section header. This failed to correctly identify non-zipfiles that contained this header. Now the zipfile.is_zipfile function verifies the first central directory entry. Changes: * Extended zipfile.is_zipfile to verify zipfile catalog * Added tests to validate failure of binary non-zipfiles * Reuse 'concat' handling for is_zipfile (cherry picked from commit 1298511) Co-authored-by: Tim Hatch <timhatch@netflix.com> Co-authored-by: John Jolly <john.jolly@gmail.com>
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bpo-28494: Improve zipfile.is_zipfile reliability
The zipfile.is_zipfile function would only search for the EndOfZipfile
section header. This failed to correctly identify non-zipfiles that
contained this header. Now the zipfile.is_zipfile function verifies
the first central directory entry.
Changes:
(cherry picked from commit 1298511)
Co-authored-by: Tim Hatch timhatch@netflix.com
Co-authored-by: John Jolly john.jolly@gmail.com