CVE-2026-59937 | 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 6.14.0, an attacker can craft a PDF with repeated malformed cross-reference streams that cause pypdf to spend long runtimes recovering broken cross-reference table entries. This issue is fixed in version 6.14.0.

Metadata

CVE ID: CVE-2026-59937
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-07 18:20 UTC
Published: 2026-07-08 17:25 UTC
Last updated: 2026-07-09 14:41 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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
py-pdf	pypdf	—	< 6.14.0

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 (4)

https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v
https://github.com/py-pdf/pypdf/pull/3887 https://github.com/py-pdf/pypdf/pull/3887
https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae
https://github.com/py-pdf/pypdf/releases/tag/6.14.0 https://github.com/py-pdf/pypdf/releases/tag/6.14.0