{"id":"CVE-2026-112941","title":"filelock: SoftReadWriteLock follows a lock tree swapped in after its first acquire and writes lock records into directories of the user running the lock","summary":"filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftReadWriteLock and AsyncSoftReadWriteLock cache a successful check of the <path>.rw lock tree and resolve its names again during later record operations,…","severity":"low","cvss":3.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","cvssSource":"cna","cwe":["CWE-367"],"vendor":"tox-dev","product":"filelock","affected":["filelock >= 4.1.0, < 4.2.1"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T14:43:18.060Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112941","references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-wfhq-q4j2-c37m","label":"https://github.com/tox-dev/filelock/security/advisories/GHSA-wfhq-q4j2-c37m"},{"url":"https://github.com/tox-dev/filelock/pull/842","label":"https://github.com/tox-dev/filelock/pull/842"},{"url":"https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03","label":"https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03"},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","label":"https://github.com/tox-dev/filelock/releases/tag/4.2.1"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T15:09:24.117Z","slug":"CVE-2026-112941","body":"## Overview\n\nfilelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftReadWriteLock and AsyncSoftReadWriteLock cache a successful check of the <path>.rw lock tree and resolve its names again during later record operations, allowing another local user who can replace that tree after the first acquisition to redirect lock-record writes into directories writable by the lock user. This issue is fixed in version 4.2.1.\n\n## Affected\n\n- `filelock >= 4.1.0, < 4.2.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":18,"depthScoreParts":{"impact":18.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}