{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-112938","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-10-19T21:30:47.245Z","datePublished":"2026-11-05T21:51:04.350Z","dateUpdated":"2026-11-05T21:51:04.350Z"},"containers":{"cna":{"title":"filelock: StrictSoftFileLock follows a symbolic link swapped in at <path>.filelock and creates claim files in a directory another local user chooses","problemTypes":[{"descriptions":[{"cweId":"CWE-363","lang":"en","description":"CWE-363: Race Condition Enabling Link Following","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/tox-dev/filelock/security/advisories/GHSA-m462-7rxw-wvpg","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tox-dev/filelock/security/advisories/GHSA-m462-7rxw-wvpg"},{"name":"https://github.com/tox-dev/filelock/pull/839","tags":["x_refsource_MISC"],"url":"https://github.com/tox-dev/filelock/pull/839"},{"name":"https://github.com/tox-dev/filelock/commit/aaa18595d29795fab599a69d6b184d9a505dab4b","tags":["x_refsource_MISC"],"url":"https://github.com/tox-dev/filelock/commit/aaa18595d29795fab599a69d6b184d9a505dab4b"},{"name":"https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03","tags":["x_refsource_MISC"],"url":"https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03"},{"name":"https://github.com/tox-dev/filelock/releases/tag/4.2.1","tags":["x_refsource_MISC"],"url":"https://github.com/tox-dev/filelock/releases/tag/4.2.1"}],"affected":[{"vendor":"tox-dev","product":"filelock","versions":[{"version":">= 3.30.0, < 4.2.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-11-05T21:51:04.350Z"},"descriptions":[{"lang":"en","value":"filelock is a platform-independent file lock for Python. From 3.30.0 until 4.2.1, On POSIX platforms, StrictSoftFileLock and AsyncStrictSoftFileLock validate the coordination directory in _ensure_protocol_directory but later reach the claims directory through _open_directory by pathname, allowing a local account that can rename the coordination name to swap in a symbolic link between check and use during acquisition. That race can create and leave claim files in another writable directory or strand claims in a different strict lock so the second lock times out. Separately, the claims property and force_break follow a resting symbolic link without a race when the lock user inspects or recovers the lock. Claims inspection discloses a file name to the other account only if the resulting exception text or claim_name reaches that account through a shared log, CI output, or error report. A blind force_break recovery that removes live claims from another strict lock can allow two processes into that lock's critical section; this path reaches other strict locks, not arbitrary files. This issue is fixed in version 4.2.1."}],"source":{"advisory":"GHSA-m462-7rxw-wvpg","discovery":"UNKNOWN"}}}}