{"id":"CVE-2026-112906","state":"PUBLISHED","title":"filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre-dated file passed on through inode reuse","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.","publishedAt":"2026-10-20T14:09:51.934Z","updatedAt":"2026-10-20T15:27:25.903Z","severity":{"score":4.7,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["tox-dev filelock"],"affected":[{"vendor":"tox-dev","product":"filelock","versions":[{"version":">= 4.1.0, < 4.2.1","status":"affected"}]}],"references":["https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","https://github.com/tox-dev/filelock/releases/tag/4.2.1"],"weaknesses":["CWE-694"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/112xxx/CVE-2026-112906.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-112906","state":"PUBLISHED","datePublished":"2026-10-20T14:09:51.934Z","dateUpdated":"2026-10-20T15:27:25.903Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-19T20:16:09.857Z"},"containers":{"cna":{"title":"filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre-dated file passed on through inode reuse","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"tox-dev","product":"filelock","versions":[{"version":">= 4.1.0, < 4.2.1","status":"affected"}]}],"references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","name":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","name":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","tags":["x_refsource_MISC"]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","name":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-694","lang":"en","description":"CWE-694: Use of Multiple Resources with Duplicate Identifier","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-20T14:09:51.934Z"},"source":{"advisory":"GHSA-2g95-wg33-c5x2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-20T15:27:04.618631Z","id":"CVE-2026-112906","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-20T15:27:25.903Z"}}]}}}