{"schemaVersion":3,"id":"CVE-2026-112911","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, StrictSoftFileLock versions from 3.30.0 and SoftReadWriteLock versions from 4.0.0 can adopt a protocol directory created first by another local user in a shared parent directory, allowing that user to alter protocol state and admit concurrent holders. This issue is fixed in version 4.2.1.","dates":{"published":"2026-10-20T14:21:24.480Z","modified":"2026-10-20T14:21:24.480Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":6.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":6.3,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":6.3,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-283","name":"Unverified Ownership","description":"The product does not properly verify that a critical resource is owned by the proper entity.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/283.html"}],"affected":[{"vendor":"tox-dev","product":"filelock","name":"filelock","label":"filelock","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 3.30.0, < 4.2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 3.30.0, < 4.2.1","eol":null,"hubHref":"/vendor/tox-dev/filelock"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-9c4x-gm8v-wgc4","label":"github.com/tox-dev/filelock/security/advisories/GHSA-9c4x-gm8v-wgc4","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/tox-dev/filelock/pull/839","label":"github.com/tox-dev/filelock/pull/839","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03","label":"github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03","hostname":"github.com","tags":["X Refsource MISC"]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","label":"github.com/tox-dev/filelock/releases/tag/4.2.1","hostname":"github.com","tags":["X Refsource MISC"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-20T14:21:24.480Z","label":"Published","detail":"Vulnerability first disclosed.","source":null}],"risk":{"score":25,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T19:36:42.149Z","stale":false,"partial":false}}