{"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"}}}}

{}

{"affected": [{"affectedData": [{"product": "filelock", "vendor": "tox-dev", "versions": [{"status": "affected", "version": ">= 3.30.0, < 4.2.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-112938", "lastModified": "2026-11-05T22:17:47.213", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.0, "impactScore": 4.7, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-05T22:17:47.213", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/commit/aaa18595d29795fab599a69d6b184d9a505dab4b"}, {"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/commit/bfa066d65a1ba9106f86ee9d027f7588b9c77e03"}, {"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/pull/839"}, {"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/releases/tag/4.2.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-m462-7rxw-wvpg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-363"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}