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CVE-2026-27026

MEDIUM CVSS: 5.5 Published: 2026-02-20 Modified: 2026-06-17

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.

Affected Platforms

Pypdf Project Pypdf

Weakness Type

CWE-770

References