{"id":"CVE-2026-112937","title":"filelock: ReadWriteLock on the hard-link route deletes any directory another user renames onto its .filelock-* link directory name","summary":"filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, ReadWriteLock can remove a randomized .filelock-* private-hard-link directory during cleanup, allowing another local user with rename access in a non-sticky…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","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":"2026-10-20T14:36:28.129Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112937","references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-jqc4-5cvw-7w85","label":"https://github.com/tox-dev/filelock/security/advisories/GHSA-jqc4-5cvw-7w85"},{"url":"https://github.com/tox-dev/filelock/pull/834","label":"https://github.com/tox-dev/filelock/pull/834"},{"url":"https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d","label":"https://github.com/tox-dev/filelock/commit/5e3f2ec0c5fb17cb2635b60b2b68bc63ab81ca2d"},{"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":"2026-10-20T15:09:24.120Z","slug":"CVE-2026-112937","body":"## Overview\n\nfilelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, ReadWriteLock can remove a randomized .filelock-* private-hard-link directory during cleanup, allowing another local user with rename access in a non-sticky parent to observe a live name or forge a dead-owner sweep name and rename a sibling directory onto it for deletion. 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":34,"depthScoreParts":{"impact":33.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}