GitHub Advisoryadvisory · PyPI

GHSA-g9xf-7f8q-9mcj pypdf: Possible infinite loop when processing threads/articles in writer

MEDIUM Published 2026-07-09 Modified 2026-07-09 Official page ↗
Aliases
CVE-2026-54651
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
2026-07-09

Affected packages

• PyPI pypdf: < 6.13.1 → fixed in 6.13.1

Description

Impact 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. Patches This has been fixed in pypdf==6.13.1. Workarounds If users cannot upgrade yet, consider applying the changes from PR #3839.

Related

Alias · CVE (1)

  • CVE-2026-54651 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References