{"identifier":"CVE-2026-112906","cve":{"id":"CVE-2026-112906","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.","published":"2026-10-20T15:17:15.163000+00:00","modified":"2026-10-27T21:06:04.367000+00:00","status":"Analyzed","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","cvss_version":"3.1","affected":[{"criteria":"cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*","versionStartIncluding":"4.1.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"4.2.1"}],"weaknesses":["CWE-362","CWE-694"],"references":[{"url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","source":"security-advisories@github.com","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":4.7,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.0,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-20T15:27:04.618631Z","id":"CVE-2026-112906","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:tox-dev:filelock:*:*:*:*:*:python:*:*","versionStartIncluding":"4.1.0","versionEndExcluding":"4.2.1","matchCriteriaId":"31B267AC-304F-4789-837A-A3B9C93347EE"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:26:14.119633+00:00","exploited":false,"kev_stale":false,"products":["tox-dev / filelock"],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00168,"percentile":0.06186,"date":"2026-10-29","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"github.com","source_url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","investigate_url":"https://investigate.aeglixmind.com/#github.com"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-112906","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-112906","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-112906","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}