{"id":"CVE-2026-112909","published":"2026-10-20T15:17:15.313","lastModified":"2026-10-22T22:18:02.470","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.","cvssScore":6.1,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","cwes":["CWE-706"],"vendors":[],"products":[],"references":[{"url":"https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a","tags":[]},{"url":"https://github.com/tox-dev/filelock/pull/835","tags":[]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","tags":[]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879","tags":[]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879","tags":[]}],"exploitRefs":[{"url":"https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a","tags":[]},{"url":"https://github.com/tox-dev/filelock/pull/835","tags":[]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","tags":[]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879","tags":[]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879","tags":[]}],"hasPoc":true,"ai":null}