GitHub Advisoryadvisory · PyPI

GHSA-39mj-jf6j-2qj3 pypdf: Possible infinite loop when hitting EOF in standard xref table

MEDIUM Published 2026-10-21 Modified 2026-10-21 Official page ↗
Aliases
CVE-2026-113794
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weaknesses
CWE-835
Reviewed
2026-10-21

Affected packages

• PyPI pypdf: < 6.20.0 → fixed in 6.20.0

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table. Patches This has been fixed in pypdf==6.20.0. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4170. Notes This has been reported through both the secure channel and as a public issue at #4169.

Related

Alias · CVE (1)

  • CVE-2026-113794 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References