{"id":"CVE-2026-112906","title":"filelock: SoftFileLock evicts a fresh lock file whose watched age another local user's pre-dated file passed on through inode reuse","summary":"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 w…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N","cvssSource":"cna","cwe":["CWE-694"],"vendor":"tox-dev","product":"filelock","affected":["filelock >= 4.1.0, < 4.2.1"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-20T15:27:04.618631Z"},"exploitAvailable":true,"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T15:27:25.903Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-112906","references":[{"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2","label":"https://github.com/tox-dev/filelock/security/advisories/GHSA-2g95-wg33-c5x2"},{"url":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b","label":"https://github.com/tox-dev/filelock/commit/740ff666b62a88496c8d7394e4e6230605e4d62b"},{"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","label":"https://github.com/tox-dev/filelock/releases/tag/4.2.1"}],"tags":["cve.org","exploit-available"],"ingestedAt":"2026-10-20T15:09:24.131Z","slug":"CVE-2026-112906","body":"## Overview\n\nfilelock 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.\n\n## Affected\n\n- `filelock >= 4.1.0, < 4.2.1`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":38,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":225965,"id":"CVE-2026-112906","ts":1792512732062,"field":"exploit_available","old":"false","new":"true"}]}