{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-112909", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-19T20:16:09.857Z", "datePublished": "2026-10-20T14:16:02.317Z", "dateUpdated": "2026-10-20T14:16:02.317Z"}, "containers": {"cna": {"title": "filelock: UnixFileLock truncates and chmods any regular file another user renames or hard-links onto the lock path", "problemTypes": [{"descriptions": [{"cweId": "CWE-706", "lang": "en", "description": "CWE-706: Use of Incorrectly-Resolved Name or Reference", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-69hj-f68j-2879"}, {"name": "https://github.com/tox-dev/filelock/pull/835", "tags": ["x_refsource_MISC"], "url": "https://github.com/tox-dev/filelock/pull/835"}, {"name": "https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a", "tags": ["x_refsource_MISC"], "url": "https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a"}, {"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": "< 4.2.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-20T14:16:02.317Z"}, "descriptions": [{"lang": "en", "value": "filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1."}], "source": {"advisory": "GHSA-69hj-f68j-2879", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "filelock", "vendor": "tox-dev", "versions": [{"status": "affected", "version": "< 4.2.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "filelock is a platform-independent file lock for Python. Prior to 4.2.1, UnixFileLock can truncate a regular file renamed onto the lock path when another local user has actual rename permission, or hard-linked there under a permissive hard-link policy; when an explicit mode is requested, affected versions from 3.10.2 can also change that file's mode. This issue is fixed in version 4.2.1."}], "id": "CVE-2026-112909", "lastModified": "2026-10-20T15:17:15.313", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 6.1, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-20T15:17:15.313", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a"}, {"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/pull/835"}, {"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-69hj-f68j-2879"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-706"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.2.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "filelock", "source": "cna", "vendor": "tox-dev"}, "product": "filelock", "vendor": "tox-dev"}], "created": "2026-10-20T16:30:06.626251+00:00", "updated": "2026-10-20T17:00:18.308079+00:00", "vendors": ["tox-dev", "tox-dev$PRODUCT$filelock"]}