CVE-2026-57204 | pypdf is a free and open-source pure-python PDF library. Pri… | CVSS 6.9 MEDIUM

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.

Metadata

CVE ID: CVE-2026-57204
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-24 02:00 UTC
Published: 2026-06-30 21:59 UTC
Last updated: 2026-06-30 21:59 UTC
Primary CWE: CWE-400
CWE-400: Uncontrolled Resource Consumption
Vendor / Product: py-pdf / pypdf
Sources: cve.org · NVD

Severity & Metrics

6.9 MEDIUM CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Affected products (1)

Vendor	Product	Platform	Versions
py-pdf	pypdf	—	< 6.13.3

Weakness (CWE)

CWE	Source	Description
CWE-400	cna	CWE-400: Uncontrolled Resource Consumption

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.9	MEDIUM	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References (2)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94 https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94
https://github.com/py-pdf/pypdf/releases/tag/6.13.3 https://github.com/py-pdf/pypdf/releases/tag/6.13.3