VULNERABILITY INTELLIGENCE

CVE-2026-27026

CVSS score6.9 MEDIUM

EPSS probability0.19%

CISA KEVNot currently listed

Published2026-02-20

Last modified2026-06-17

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.7.1, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed /FlateDecode stream, where the byte-by-byte decompression is used. This vulnerability is fixed in 6.7.1.