CVE-2026-59203CWE-835

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

Medium · published July 14, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
33.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00399 · 33.0th percentile
Weakness
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')
Published
2026-07-14T15:43Z
EPSS history
Timeline
  • 14 JUL 15:43Z
    Pillow EpsImagePlugin negative %%BeginBinary byte count causes infinite loop denial of service
    cvelistv5