CVE-2025-8291
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.
- Exploit odds
- 0.5% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.5% in the next 30 days (EPSS).
- Severity: 4.3 MEDIUM (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.5% · EPSS, next 30 days
- Weakness
- CWE-1285
- Record status
- Deferred
Attack profile CVSS 3.1 · 4.3
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- Low
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2025-8291.md and follow it. Check whether this project is affected by CVE-2025-8291. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- 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
- https://github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3
- https://github.com/python/cpython/pull/139702
- https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6p
References
- 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
- https://github.com/python/cpython/commit/d11e69d6203080e3ec450446bfed0516727b85c3
- https://github.com/python/cpython/issues/139700
- https://github.com/python/cpython/pull/139702
- https://mail.python.org/archives/list/[email protected]/thread/QECOPWMTH4VPPJAXAH2BGTA4XADOP62G/
- https://github.com/google/security-research/security/advisories/GHSA-hhv7-p4pg-wm6p
- https://github.com/psf/advisory-database/blob/main/advisories/python/PSF-2025-12.json