Medium severity4.3OSV Advisory· Published Oct 7, 2025· Updated Apr 15, 2026
CVE-2025-8291
CVE-2025-8291
Description
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 products
1- Range: v0.9.8, v0.9.9, v1.0.1, …
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
12- github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6pnvd
- github.com/psf/advisory-database/blob/main/advisories/python/PSF-2025-12.jsonnvd
- github.com/python/cpython/commit/162997bb70e067668c039700141770687bc8f267nvd
- github.com/python/cpython/commit/1d29afb0d6218aa8fb5e1e4a6133a4778d89bb46nvd
- github.com/python/cpython/commit/333d4a6f4967d3ace91492a39ededbcf3faa76a6nvd
- github.com/python/cpython/commit/76437ac248ad8ca44e9bf697b02b1e2241df2196nvd
- github.com/python/cpython/commit/8392b2f0d35678407d9ce7d95655a5b77de161b4nvd
- github.com/python/cpython/commit/bca11ae7d575d87ed93f5dd6a313be6246e3e388nvd
- github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3nvd
- github.com/python/cpython/issues/139700nvd
- github.com/python/cpython/pull/139702nvd
- mail.python.org/archives/list/security-announce@python.org/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/nvd
News mentions
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