Medium severity5.5NVD Advisory· Published Jun 22, 2026· Updated Jun 24, 2026
CVE-2026-54651
CVE-2026-54651
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.13.1 | 6.13.1 |
Affected products
3Patches
Vulnerability mechanics
References
5- github.com/py-pdf/pypdf/releases/tag/6.13.1nvdPatchWEB
- github.com/py-pdf/pypdf/security/advisories/GHSA-g9xf-7f8q-9mcjnvdMitigationPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-g9xf-7f8q-9mcjghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-54651ghsaADVISORY
- github.com/py-pdf/pypdf/pull/3839nvdIssue TrackingWEB
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