CVE-2026-42310

Pillow: PDF Parsing Trailer Infinite Loop (DoS)

State: Published
Severity: 5.1 Medium
Published: May 9, 2026
Updated: May 12, 2026
Reserved: Apr 26, 2026

Description

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.

Scores

CVSS	Score	Vector	Source
4.0	5.1 Medium	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N	GitHub_M

Weaknesses

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

Product	Versions
Pillowpython-pillow	>= 4.2.0, < 12.2.0Affected

References

https://github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7
https://github.com/python-pillow/Pillow/pull/9519
https://github.com/python-pillow/Pillow/commit/3bf614e4b8615d0ce1d5039efaf6db447fe7c468
https://github.com/python-pillow/Pillow/releases/tag/12.2.0

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