{"id":"BIT-pillow-2026-55798","summary":"Pillow: WindowsViewer.get_command() OS command injection via unescaped shell path","details":"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.","aliases":["CVE-2026-55798","GHSA-4x4j-2g7c-83w6","PYSEC-2026-2257"],"modified":"2026-07-13T07:26:48.229039344Z","published":"2026-07-08T11:34:13.482Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:python:pillow:*:*:*:*:*:*:*:*"]},"references":[{"type":"WEB","url":"https://github.com/python-pillow/Pillow/blob/main/docs/releasenotes/12.3.0.rst"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/8404ea5fe5df40fc34aa1e51403dd6fce0778b8a"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/88194166691b7b603529b8b036ab3ab9cedd2de4"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/commit/b0e06caa64c1405aa3da0bb1d2bd9a77ca22de7f"},{"type":"WEB","url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-4x4j-2g7c-83w6"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55798"}],"affected":[{"package":{"name":"pillow","ecosystem":"Bitnami","purl":"pkg:bitnami/pillow"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"12.3.0"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/pillow/BIT-pillow-2026-55798.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L"}]}],"schema_version":"1.7.5"}