CVE-2025-55197

pypdf is a free and open-source pure-python PDF library. Prior to version 6.0.0, an attacker can craft a PDF which leads to the RAM being exhausted. This requires just reading the file if a series of FlateDecode filters is used on a malicious cross-reference stream. Other content streams are affected on explicit access. This issue has been fixed in 6.0.0. If an update is not possible, a workaround involves including the fixed code from pypdf.filters.decompress into the existing filters file.

• CWE-400
• CWE-770

• https://github.com/py-pdf/pypdf/blob/0dd57738bbdcdb63f0fb43d8a6b3d222b6946595/pypdf/filters.py#L72-L143Product
• https://github.com/py-pdf/pypdf/issues/3429Issue Tracking
• https://github.com/py-pdf/pypdf/pull/3430Patch
• https://github.com/py-pdf/pypdf/releases/tag/6.0.0Release Notes
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8mMitigation, Third Party Advisory

Published

Aug 13, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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