GitHub Advisoryadvisory · PyPI

GHSA-jfx9-29x2-rv3j pypdf can exhaust RAM via manipulated LZWDecode streams

MEDIUM Published 2025-10-22 Modified 2025-10-23 Official page ↗
Aliases
CVE-2025-62708
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:H/SC:N/SI:N/SA:N/E:U
Weaknesses
CWE-409
Reviewed
2025-10-22

Affected packages

• PyPI pypdf: < 6.1.3 → fixed in 6.1.3

Description

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the content stream of a page using the LZWDecode filter. Patches This has been fixed in pypdf==6.1.3. Workarounds If you cannot upgrade yet, consider applying the changes from PR #3502.

Related

Alias · CVE (1)

  • CVE-2025-62708 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (1)

  • CWE-409 Improper Handling of Highly Compressed Data (Data Amplification) weakness

References