{"identifier":"CVE-2026-112935","cve":{"id":"CVE-2026-112935","description":"filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, SoftFileLock can break a stale marker after an attacker frees its own marker following the stale read, an honest contender creates a live successor on the reused inode, and the successor's modification time is not newer than the saved observation, causing the live marker to be removed and two holders to be admitted. This issue is fixed in version 4.2.1.","published":"2026-10-20T15:17:16.243000+00:00","modified":"2026-10-28T15:17:02.940000+00:00","status":"Modified","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":"3.22.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"4.2.1"}],"weaknesses":["CWE-367"],"references":[{"url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/tox-dev/filelock/pull/843","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-fq56-3cx3-fjxp","source":"security-advisories@github.com","tags":["Exploit","Mitigation","Patch","Vendor Advisory"]},{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-fq56-3cx3-fjxp","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":"2026-10-28T14:16:43.594543Z","id":"CVE-2026-112935","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":"3.22.0","versionEndExcluding":"4.2.1","matchCriteriaId":"5011FF77-7621-4E3E-8642-79A413FEAE97"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T17:25:27.088974+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":0.00132,"percentile":0.02759,"date":"2026-10-28","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-2026-112935","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-112935","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-112935","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."}}