{"schemaVersion":3,"id":"CVE-2026-112906","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-10-20T14:09:51.934Z","modified":"2026-10-20T15:27:25.903Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":4.7,"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:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":4.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":4.7,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","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-694","name":"Use of Multiple Resources with Duplicate Identifier","description":"The product uses multiple resources that can have the same identifier, in a context in which unique identifiers are required.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/694.html"}],"affected":[{"vendor":"tox-dev","product":"filelock","name":"filelock","label":"filelock","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.1.0, < 4.2.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.1.0, < 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-2g95-wg33-c5x2","label":"github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","label":"github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","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":"2026-10-20T14:09:51.934Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-20T15:27:25.903Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":19,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T21:25:18.782Z","stale":false,"partial":false}}