CVE-2026-59203

MEDIUM5.3

Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service

Published Jul 14, 2026

Modified 6 days ago

Details

Pillow is a Python imaging library. From 12.0.0 through 12.2.0, Pillow's EPS parser in PIL/EpsImagePlugin.py accepts a negative byte count in the %%BeginBinary directive, allowing a crafted EPS file to cause Image.open() to seek backwards to the same directive and parse it repeatedly in an infinite loop. This issue is fixed in version 12.3.0.

References

WEB

https://github.com/python-pillow/Pillow/commit/03992618118b4a76b6163cd72ab5ecd684133b83

WEB

https://github.com/python-pillow/Pillow/pull/9708

WEB

https://github.com/python-pillow/Pillow/releases/tag/12.3.0

DETECTION

https://github.com/python-pillow/Pillow/security/advisories/GHSA-pg7v-jwj7-p798

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-59203

CVSS Analysis