CVE-2026-55798CWE-78

Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path

Medium · published July 6, 2026

CVSS v3.1
4.5
EPSS
0%
Percentile
7.1
In the wild
Unconfirmed
What it is

Pillow is a Python imaging library. Prior to 12.3.0, WindowsViewer.get_command() constructed a cmd.exe shell command by directly embedding a file path into an f-string without escaping and passed the result to subprocess.Popen(..., shell=True), allowing shell metacharacters in the file path to inject arbitrary cmd.exe commands. This issue is fixed in version 12.3.0.

The record
Technical detail
CVSS v3.1
4.5 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00179 · 7.1th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-07-06T18:44Z
EPSS history
Timeline
  • 06 JUL 18:44Z
    Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path
    cvelistv5