CVE-2026-55798
MEDIUMPillow: WindowsViewer.get_command() OS command injection via unescaped shell path
Title source: cnaDescription
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.
References (5)
Core 5
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f
X_Refsource_Misc x_refsource_misc
https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst
Scores
CVSS v3
4.5
EPSS
0.0014
EPSS Percentile
3.5%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-78
Status
published
Products (2)
python/pillow
< 12.3.0
python-pillow/Pillow
< 12.3.0
Published
Jul 06, 2026
Tracked Since
Jul 07, 2026