GitHub Advisoryadvisory · PyPI

GHSA-62m5-6wh8-28x7 pypdf has possible long runtimes/large memory usage for encrypted PDF files

HIGH Published 2026-10-30 Modified 2026-10-30 Official page ↗
Aliases
CVE-2026-119208
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-400, CWE-770
Reviewed
2026-10-30

Affected packages

• PyPI pypdf: < 6.21.3 → fixed in 6.21.3

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to large runtimes/memory usage. This requires accessing the page count of an encrypted PDF file, which itself declares a wrong `/Count` value. Patches This has been fixed in pypdf==6.21.3. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4270.

Related

Alias · CVE (1)

  • CVE-2026-119208 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (2)

  • CWE-400 Uncontrolled Resource Consumption weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling weakness

References