Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Python | Pillow | < 12.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstRelease Notes
- https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fcePatch
- https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cPatch
- https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77cPatch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6ExploitVendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6ExploitVendor Advisory
FAQ
What is CVE-2026-55798?
CVE-2026-55798 is a vulnerability with a CVSS score of 4.5 (MEDIUM). 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 ...
How severe is CVE-2026-55798?
CVE-2026-55798 has been rated MEDIUM with a CVSS base score of 4.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-55798?
Check the references section above for vendor advisories and patch information. Affected products include: Python Pillow.