CVE-2026-55798
Medium
Description
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.
SeverityMedium
CVSS4.5
Exploit probability—
Product
Python Pillow
PublishedJul 6, 2026
First seenJul 6, 2026
Weakness typeCWE-78OS command injection
How to fix
Update
- python pillow12.3.0 or later
- pillow12.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| python pillow | v < 12.3.0 | 12.3.0 |
| pillowPyPI | v < 12.3.0 | 12.3.0 |
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