CVE-2025-8291 - CVE House
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Status published Medium CVE-2025-8291

ZIP64 End of Central Directory (EOCD) Locator record offset not checked

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Caleb Brown (Google)
  • Serhiy Storchaka
  • Seth Larson

References

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Affected Vendor

Python Software Foundation

View all reports →

Affected Software

CPython
Vulnerable Versions:
0, 3.11.0, 3.12.0, 3.13.0, 3.14.0

Timeline

Official Publish: October 7th, 2025
Last Modified: April 21st, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.