CVE-2026-54531 | 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 6.13.0, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires merging a file with outlines into a writer. This vulnerability is fixed in 6.13.0.

Metadata

CVE ID: CVE-2026-54531
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-15 18:40 UTC
Published: 2026-06-22 20:26 UTC
Last updated: 2026-06-22 20:26 UTC
Primary CWE: CWE-835
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loo…
Vendor / Product: py-pdf / pypdf
Sources: cve.org · NVD

Severity & Metrics

6.9 MEDIUM CVSS 4.0

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

Affected products (1)

Vendor	Product	Platform	Versions
py-pdf	pypdf	—	< 6.13.0

Weakness (CWE)

CWE	Source	Description
CWE-835	cna	CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')

CVSS scores (1)

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

References (3)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96 https://github.com/py-pdf/pypdf/security/advisories/GHSA-m2v9-299j-rv96
https://github.com/py-pdf/pypdf/pull/3830 https://github.com/py-pdf/pypdf/pull/3830
https://github.com/py-pdf/pypdf/releases/tag/6.13.0 https://github.com/py-pdf/pypdf/releases/tag/6.13.0