CVE-2026-54531

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0.

Score

CVSS 4.0 6.9 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-06-22

Last modified

2026-10-25

Weaknesses

CWE-835

Affected products

• Pypdf (Py-pdf)
• Pypdf (Pypdf Project)

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96
• https://github.com/py-pdf/pypdf/pull/3830
• https://github.com/py-pdf/pypdf/releases/tag/6.13.0