CVE-2026-55798

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.

CVSS v3 4.5 MEDIUM

4.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 3.4

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst	Release Notes
https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a	Patch
https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4	Patch
https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f	Patch
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6	Exploit Vendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*

History

25 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) Pillow es una biblioteca de imágenes de Python. Antes de la versión 12.3.0, WindowsViewer.get_command() construía un comando de shell de cmd.exe al incrustar directamente una ruta de archivo en una f-string sin escape y pasaba el resultado a subprocess.Popen(..., shell=True), permitiendo que los metacaracteres de shell en la ruta del archivo inyectaran comandos arbitrarios de cmd.exe. Este problema está solucionado en la versión 12.3.0.

Information

Published : 2026-07-06 19:17

Updated : 2026-10-25 20:10

NVD link : CVE-2026-55798

Mitre link : CVE-2026-55798

CVE.ORG link : CVE-2026-55798

JSON object : View

Products Affected

python

pillow

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

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