CVE-2026-57204

MediumCVSS 6.5/10Last modified Nov 2, 2026

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.13.3, a maliciously crafted PDF can cause DoS. An attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as MAX_DECLARED_STREAM_LENGTH is sometimes ignored. This requires parsing a content stream without a /Length value. This issue has been fixed in version 6.13.3.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
py-pdf	pypdf	< 6.13.3

References

https://github.com/py-pdf/pypdf/releases/tag/6.13.3Product, Release Notes
https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94Patch, Vendor Advisory

Timeline

Published: Jun 30, 2026
Last modified: Nov 2, 2026
NVD status: Analyzed

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