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Vulnerability record · CVE-2026-55798 · published 6 July 2026

CVE-2026-55798: Python pillow os command injection vulnerability

Python · Pillow

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.

4.5 CVSS 3.1 Medium EPSS 0.18% · top 93.3% CWE-78 · OS command injection
4.5CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
7 Jul 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 ExploitVendor Advisory
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-55798), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.