{"id":"CVE-2026-112909","revision":"e5dc3cc99413412682d702bc02e13169","records":[{"revision":"e5dc3cc99413412682d702bc02e13169","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-112909","aliases":[],"title":"filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path","description":"filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1.","state":0,"publishedAt":"2026-10-20T14:16:02.317+00:00","modifiedAt":"2026-10-22T21:25:25.906+00:00","affected":[{"ecosystem":"Vendor product","name":"filelock","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"tox-dev\",\n                    \"product\": \"filelock\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.2.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879","https://github.com/tox-dev/filelock/pull/835","https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a","https://github.com/tox-dev/filelock/releases/tag/4.2.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112909","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-112909","identifiers":["CVE-2026-112909"]},"retained":false,"historicalAffected":[]}],"coverage":[]}