GitHub Advisoryadvisory · PyPI

GHSA-gmh7-3g9r-mjh5 pypdf: Possible long runtimes for large xref table header limits

HIGH Published 2026-10-23 Modified 2026-10-23 Official page ↗
Aliases
CVE-2026-115580
Ecosystem
PyPI
Packages
pypdf
Severity
High
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-834
Reviewed
2026-10-23

Affected packages

• PyPI pypdf: < 6.21.2 → fixed in 6.21.2

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires opening a file with large/wrong upper limits in the xref table. Patches This has been fixed in pypdf==6.21.2. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4239.

Related

Alias · CVE (1)

  • CVE-2026-115580 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-834 Excessive Iteration weakness

References