GitHub Advisoryadvisory · PyPI

GHSA-55h5-xmcq-c37v pypdf: Possible long runtimes for repeated malformed cross-reference entries

MEDIUM Published 2026-07-23 Modified 2026-07-23 Official page ↗
Aliases
CVE-2026-59937
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weaknesses
CWE-400
Reviewed
2026-07-23

Affected packages

• PyPI pypdf: < 6.14.0 → fixed in 6.14.0

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with repeated malformed cross-reference streams. Patches This has been fixed in pypdf==6.14.0. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3887.

Related

Alias · CVE (1)

  • CVE-2026-59937 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References