CVE-2026-59938 | 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 declared image size values that are much too large compared to the actual data, causing large memory usage in pypdf image parsing. This issue is fixed in version 6.14.0.

Metadata

CVE ID: CVE-2026-59938
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-07-07 18:20 UTC
Published: 2026-07-08 17:24 UTC
Last updated: 2026-07-08 17:24 UTC
Primary CWE: CWE-789
CWE-789: Memory Allocation with Excessive Size Value
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	—	< 6.14.0

Weakness (CWE)

CWE	Source	Description
CWE-789	cna	CWE-789: Memory Allocation with Excessive Size Value

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-5qjq-93h5-hrgp https://github.com/py-pdf/pypdf/security/advisories/GHSA-5qjq-93h5-hrgp
https://github.com/py-pdf/pypdf/pull/3888 https://github.com/py-pdf/pypdf/pull/3888
https://github.com/py-pdf/pypdf/commit/c64583be16b8e8763d8777075f8ecbf382014b7a https://github.com/py-pdf/pypdf/commit/c64583be16b8e8763d8777075f8ecbf382014b7a
https://github.com/py-pdf/pypdf/releases/tag/6.14.0 https://github.com/py-pdf/pypdf/releases/tag/6.14.0