CVE-2026-59203

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

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.

Affected

python-pillow · Pillow

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 GITHUB

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.40% chance of exploitation in the next 30 days, 33rd percentile

Published

2026-07-14

Updated

2026-07-15

Proof-of-concept exploits (1)

• advisories/GHSA-pg7v-jwj7-p798

Security advisories

• python-pillow/Pillow/security/advisories/GHSA-pg7v-jwj7-p798
• python-pillow/Pillow/pull/9708

References

• CVE Record
• NVD entry