ZIP64 End of Central Directory (EOCD) Locator record offset not checked
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.3epss 0.4%
exploitation probability
0.4%top 68% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Affected products
Python Software Foundation · CPythonReferences
https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6phttps://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2025-12.jsonhttps://github.com/python/cpython/commit/162997bb70e067668c039700141770687bc8f267https://github.com/python/cpython/commit/1d29afb0d6218aa8fb5e1e4a6133a4778d89bb46https://github.com/python/cpython/commit/333d4a6f4967d3ace91492a39ededbcf3faa76a6https://github.com/python/cpython/commit/76437ac248ad8ca44e9bf697b02b1e2241df2196https://github.com/python/cpython/commit/8392b2f0d35678407d9ce7d95655a5b77de161b4https://github.com/python/cpython/commit/bca11ae7d575d87ed93f5dd6a313be6246e3e388https://github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3https://github.com/python/cpython/issues/139700https://github.com/python/cpython/pull/139702https://mail.python.org/archives/list/security-announce@python.org/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/