{"id":"CVE-2026-112939","published":"2026-10-20T15:17:16.663","lastModified":"2026-10-21T18:02:59.067","description":"filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can trust a forged process identifier in a marker that an attacker can modify but cannot remove, allowing an authorized contender such as another process of the holder's account or root to act as a confused deputy, remove the live marker, and admit another holder. This issue is fixed in version 4.2.1.","cvssScore":4.7,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","cwes":["CWE-345"],"vendors":["tox-dev"],"products":["filelock"],"references":[{"url":"https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc","tags":["Patch"]},{"url":"https://github.com/tox-dev/filelock/pull/836","tags":["Patch"]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","tags":["Release Notes"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]}],"exploitRefs":[{"url":"https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc","tags":["Patch"]},{"url":"https://github.com/tox-dev/filelock/pull/836","tags":["Patch"]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","tags":["Release Notes"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]}],"hasPoc":true,"ai":null}