CVE-2026-55798
Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path
CVSS Score
4.5
EPSS Score
0.1%
EPSS Percentile
2th
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.
| CWE | CWE-78 |
| Vendor | python-pillow |
| Product | pillow |
| Published | Jul 6, 2026 |
| Last Updated | Jul 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Affected Versions
python-pillow / Pillow
< 12.3.0
References
github.com: https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6 github.com: https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a github.com: https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4 github.com: https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f github.com: https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst