CVE-2026-59938

pypdf: Possible large memory usage for wrong image dimensions

State: Published
Severity: 6.9 Medium
Published: Jul 8, 2026
Updated: Jul 9, 2026
Reserved: Jul 7, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	GitHub_M

Weaknesses

CWE-789 Memory Allocation with Excessive Size Value

Affected Products

Product	Versions
pypdfpy-pdf	< 6.14.0Affected

References

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/commit/c64583be16b8e8763d8777075f8ecbf382014b7a
https://github.com/py-pdf/pypdf/releases/tag/6.14.0

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