PT-2026-55966 · Python Pillow · Pillow

1121984919 · Published 2026-07-06 · Updated 2026-07-06 · CVE-2026-55798

NVD

CVSS v3.1

4.5

Medium

Base vector

AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

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.

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2026-55798

Affected Products

Pillow

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-55798 · Security Note
• https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6 · Note
• https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst · Note
• https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4 · Note
• https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f · Note
• https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a · Note