CVE-2026-42310

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.

Score

CVSS 3.1 5.5 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-05-09

Last modified

2026-05-12

Weaknesses

CWE-835

Affected products

• Pillow (Python)
• Pillow (Python-pillow)

References

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