GitHub Advisoryadvisory · PyPI

GHSA-mfr5-77xh-9j7h pypdf has possible infinite loop when cloning dictionaries

HIGH Published 2026-10-30 Modified 2026-10-30 Official page ↗
Aliases
CVE-2026-119205
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-835
Reviewed
2026-10-30

Affected packages

• PyPI pypdf: < 6.21.4 → fixed in 6.21.4

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires cloning/duplicating a `DictionaryObject`. Patches This has been fixed in pypdf==6.21.4. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4288.

Related

Alias · CVE (1)

  • CVE-2026-119205 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

References