GitHub Advisoryadvisory · PyPI

GHSA-f2v5-7jq9-h8cg pypdf: Manipulated RunLengthDecode streams can exhaust RAM

MEDIUM Published 2026-02-28 Modified 2026-02-28 Official page ↗
Aliases
CVE-2026-28351
Ecosystem
PyPI
Packages
pypdf
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weaknesses
CWE-400
Reviewed
2026-02-28

Affected packages

• PyPI pypdf: < 6.7.4 → fixed in 6.7.4

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream using the RunLengthDecode filter. Patches This has been fixed in pypdf==6.7.4. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3664.

Related

Alias · CVE (1)

  • CVE-2026-28351 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-400 Uncontrolled Resource Consumption weakness

References