{"id":"CVE-2026-112906","summary":"filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre-dated file passed on through inode reuse","details":"filelock is a platform-independent file lock for Python. From 4.1.0 until 4.2.1, SoftFileLock versions from 4.1.0 can reuse a stale observation when an attacker pre-dates and removes its own marker, at least two lock-user processes are waiting, coarse or matching modification times preserve the observation, and an honest contender creates a fresh marker on the reused inode, causing that live marker to be removed as stale. This issue is fixed in version 4.2.1.","aliases":["GHSA-2g95-wg33-c5x2"],"modified":"2026-10-22T02:48:51.536582953Z","published":"2026-10-20T14:09:51.934Z","database_specific":{"cwe_ids":["CWE-694"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112906.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112906.json"},{"type":"FIX","url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b"},{"type":"WEB","url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1"},{"type":"ADVISORY","url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112906"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tox-dev/filelock","events":[{"introduced":"6c0ecc28f898f08cd0438cd489c3eaabad79a4b7"},{"fixed":"60331bb89f325020b48bc51bde904c6446384e4a"},{"fixed":"740ff666b62a88496c8d7394e4e6230605e4d62b"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"4.1.0"},{"fixed":"4.2.1"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"740ff666b62a88496c8d7394e4e6230605e4d62b"}]},{"source":"REFERENCES_TAG","original_tag":"4.2.1","range":[{"fixed":"60331bb89f325020b48bc51bde904c6446384e4a"}]}]}}],"versions":["4.2.0","4.1.2","4.1.1","4.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-112906.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N"}]}