CVE-2025-8291
MEDIUMDescription
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.
How to fix
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 28% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1285 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-7848 | High | 7.8 | 4.5% | - | - |
| CVE-2023-46724 | High | 8.6 | 4.0% | - | Fix |
| CVE-2022-21821 | High | 7.8 | 2.1% | - | Fix |
| CVE-2026-2006 | High | 8.8 | 1.1% | - | Fix |
| CVE-2020-25241 | High | 7.5 | 1.0% | - | Fix |
| CVE-2025-3357 | Critical | 9.8 | 1.0% | - | - |
Common questions
How do I fix CVE-2025-8291?
Published advisories record a fix for 284 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2025-8291 being actively exploited?
Not that we know of. CVE-2025-8291 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.35% is the estimated probability that it will be exploited in the next 30 days. That is higher than 28% of all scored CVEs.
How severe is CVE-2025-8291?
CVE-2025-8291 has a CVSS v3 base score of 4.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2025-8291 affect?
Published advisories record a fix for Cython-0:0.29.21 (Rocky), Cython-0:0.29.21 (Red Hat / RHEL), Cython-debugsource-0:0.29.21 (Red Hat / RHEL), Cython-debugsource-0:0.29.21 (Rocky), and 280 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-31.