VULNERABILITY INTELLIGENCE

CVE-2025-66019

CVSS score6.6 MEDIUM

EPSS probability0.39%

CISA KEVNot currently listed

Published2025-11-26

Last modified2026-10-19

Description

pypdf is a free and open-source pure-python PDF library. Prior to version 6.4.0, an attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter. This issue has been patched in version 6.4.0.