Home/CVE/The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset val
CVE

CVE-2025-8291

The 'zipfile' module would not check the validity of the ZIP64 End of Central Directory (EOCD) Locator record offset val

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.

MEDIUM · CVSS 4.3 EPSS 0.00125
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-1285Improper Validation of Specified Index, Position, or Offset in Input
▣

Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · cna@python.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 Oct 2025 · 06:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

30
rhsaRHSA-2026:8824Moderate
rhsaRHSA-2026:8822Moderate
rhsaRHSA-2026:7443Moderate
rhsaRHSA-2026:7661Moderate
suse-csafopenSUSE-SU-2026:20081-1
🔗

References & Sources

12
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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
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