GitHub Advisoryadvisory · PyPI

GHSA-cgf9-327m-v77c pypdf: Possible large memory usage when parsing content streams

MEDIUM Published 2026-10-22 Modified 2026-10-22 Official page ↗
Aliases
CVE-2026-113791
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-400, CWE-770
Reviewed
2026-10-22

Affected packages

• PyPI pypdf: < 6.21.0 → fixed in 6.21.0

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations. Patches This has been fixed in pypdf==6.21.0. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4218.

Related

Alias · CVE (1)

  • CVE-2026-113791 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