CVE-2025-8291

Impact

The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset value would not be used to locate the ZIP64 EOCD record, instead the ZIP64 EOCD record would be assumed to be the previous record in the ZIP archive. This could be abused to create ZIP archives that are handled differently by the 'zipfile' module compared to other ZIP implementations. Remediation maintains this behavior, but checks that the offset specified in the ZIP64 EOCD Locator record matches the expected value.

Affected packages

This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.

Weakness classification

References

• NVD record
• CVE.org record
• https://github.com/python/cpython/commit/162997bb70e067668c039700141770687bc8f267
• https://github.com/python/cpython/commit/1d29afb0d6218aa8fb5e1e4a6133a4778d89bb46
• https://github.com/python/cpython/commit/333d4a6f4967d3ace91492a39ededbcf3faa76a6
• https://github.com/python/cpython/commit/76437ac248ad8ca44e9bf697b02b1e2241df2196
• https://github.com/python/cpython/commit/8392b2f0d35678407d9ce7d95655a5b77de161b4
• https://github.com/python/cpython/commit/bca11ae7d575d87ed93f5dd6a313be6246e3e388
• https://github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3
• https://github.com/python/cpython/issues/139700
• https://github.com/python/cpython/pull/139702
• https://mail.python.org/archives/list/security-announce@python.org/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/
• https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6p
• https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2025-12.json