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

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Summary

CVECVE-2026-55798
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-06 19:17:08 UTC
Updated2026-07-07 16:16:40 UTC
DescriptionPillow 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.

Risk And Classification

Primary CVSS: v3.1 4.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Problem Types: CWE-78 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.5MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
3.1CNADECLARED4.5MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Python-pillow Pillow affected < 12.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77c... [email protected] github.com
github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce... [email protected] github.com
github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9c... [email protected] github.com
github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst [email protected] github.com
github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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