{"id":"CVE-2026-112939","revision":"a70e8f500fda443b9b46fc8ba907db52","records":[{"revision":"a70e8f500fda443b9b46fc8ba907db52","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-112939","aliases":[],"title":"filelock: SoftFileLock removes a live holder's marker when another user forges the PID in a writable marker","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.","state":0,"publishedAt":"2026-10-20T14:38:52.373+00:00","modifiedAt":"2026-10-20T15:14:56.836+00:00","affected":[{"ecosystem":"Vendor product","name":"filelock","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"tox-dev\",\n                    \"product\": \"filelock\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 3.22.0, < 4.2.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","score":4.7,"severity":"MEDIUM"}],"references":["https://github.com/tox-dev/filelock/security/advisories/GHSA-rfpc-qcw5-3pc4","https://github.com/tox-dev/filelock/pull/836","https://github.com/tox-dev/filelock/commit/eeceaa846cbe4df72718d94c8371ca1ab8f5b3cc","https://github.com/tox-dev/filelock/releases/tag/4.2.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112939","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-112939","identifiers":["CVE-2026-112939"]},"retained":false,"historicalAffected":[]}],"coverage":[]}