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.
Scores
CVSS v3
4.3
EPSS
0.0011
EPSS Percentile
29.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-1285
Status
published
Products (7)
Python Software Foundation/CPython
< 3.10.19
Python Software Foundation/CPython
< 3.9.24
Python Software Foundation/CPython
3.10.0 - 3.10.19
Python Software Foundation/CPython
3.11.0 - 3.11.14
Python Software Foundation/CPython
3.12.0 - 3.12.12
Python Software Foundation/CPython
3.13.0 - 3.13.10
Python Software Foundation/CPython
3.14.0 - 3.14.1
Published
Oct 07, 2025
Tracked Since
Feb 18, 2026