GitHub Advisoryadvisory · PyPI

GHSA-996q-pr4m-cvgq pypdf has a possible infinite loop when processing TreeObject

MEDIUM Published 2026-02-18 Modified 2026-02-23 Official page ↗
Aliases
CVE-2026-27024
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
2026-02-18

Affected packages

• PyPI pypdf: < 6.7.1 → fixed in 6.7.1

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires accessing the children of a `TreeObject`, for example as part of outlines. Patches This has been fixed in pypdf==6.7.1. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3645.

Related

Alias · CVE (1)

  • CVE-2026-27024 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References