Vulnerability Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with threads/articles into a writer. This vulnerability is fixed in 6.13.1.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pypdf Project | Pypdf | < 6.13.1 |
Related Weaknesses (CWE)
References
- https://github.com/py-pdf/pypdf/pull/3839Issue Tracking
- https://github.com/py-pdf/pypdf/releases/tag/6.13.1Patch
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcjMitigationPatchVendor Advisory
FAQ
What is CVE-2026-54651?
CVE-2026-54651 is a vulnerability with a CVSS score of 5.5 (MEDIUM). pypdf is a free and open-source pure-python PDF library. Prior to 6.13.1, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with thr...
How severe is CVE-2026-54651?
CVE-2026-54651 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54651?
Check the references section above for vendor advisories and patch information. Affected products include: Pypdf Project Pypdf.