CVE-2026-55798
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…
Does this matter?
Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.
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
- 4.5 MEDIUMCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- python/pillow
- Source
- security-advisories@github.com
References
- https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rstRelease Notes
- https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8aPatch
- https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4Patch
- https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7fPatch
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6Exploit, Vendor Advisory
- https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.