GitHub Advisoryadvisory · PyPI

GHSA-m2v9-299j-rv96 pypdf: Possible infinite loop when processing outlines/bookmarks in writer

MEDIUM Published 2026-06-16 Modified 2026-06-16 Official page ↗
Aliases
CVE-2026-54531
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-835
Reviewed
2026-06-16

Affected packages

• PyPI pypdf: < 6.13.0 → fixed in 6.13.0

Description

Impact 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. Patches This has been fixed in pypdf==6.13.0. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3830.

Related

Alias · CVE (1)

  • CVE-2026-54531 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References