{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-112907", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-10-19T20:16:09.857Z", "datePublished": "2026-11-05T21:50:04.632Z", "dateUpdated": "2026-11-05T21:50:04.632Z"}, "containers": {"cna": {"title": "filelock: On Windows an oplock on a soft lock's marker holds SoftFileLock.acquire() past its timeout and blocks the stale break", "problemTypes": [{"descriptions": [{"cweId": "CWE-667", "lang": "en", "description": "CWE-667: Improper Locking", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 2.5, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/tox-dev/filelock/security/advisories/GHSA-567q-5qvw-pf92", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/tox-dev/filelock/security/advisories/GHSA-567q-5qvw-pf92"}, {"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/97d694a9a3ee1721d6c79a480174dfd9b060a080", "tags": ["x_refsource_MISC"], "url": "https://github.com/tox-dev/filelock/commit/97d694a9a3ee1721d6c79a480174dfd9b060a080"}, {"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": ">= 3.22.0, < 4.2.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-05T21:50:04.632Z"}, "descriptions": [{"lang": "en", "value": "filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, soft lock classes on Windows read an existing marker with _read_lock_file and remove a stale marker through break_lock_file using pathname operations that wait for an oplock break. Another local account with read access to an unheld marker can keep a Level 1 or batch oplock unanswered, causing SoftFileLock.acquire and related async or fallback locks to wait beyond timeout, blocking=False, and cancel_check. A stale marker under the oplock cannot be broken, but mutual exclusion remains intact and no file other than the marker is accessed. This issue is fixed in version 4.2.1."}], "source": {"advisory": "GHSA-567q-5qvw-pf92", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "filelock", "vendor": "tox-dev", "versions": [{"status": "affected", "version": ">= 3.22.0, < 4.2.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "filelock is a platform-independent file lock for Python. From 3.22.0 until 4.2.1, soft lock classes on Windows read an existing marker with _read_lock_file and remove a stale marker through break_lock_file using pathname operations that wait for an oplock break. Another local account with read access to an unheld marker can keep a Level 1 or batch oplock unanswered, causing SoftFileLock.acquire and related async or fallback locks to wait beyond timeout, blocking=False, and cancel_check. A stale marker under the oplock cannot be broken, but mutual exclusion remains intact and no file other than the marker is accessed. This issue is fixed in version 4.2.1."}], "id": "CVE-2026-112907", "lastModified": "2026-11-05T22:17:46.513", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 2.5, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-05T22:17:46.513", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/tox-dev/filelock/commit/97d694a9a3ee1721d6c79a480174dfd9b060a080"}, {"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-567q-5qvw-pf92"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "filelock: filelock: Denial of Service via Windows opportunistic lock on lock markers", "id": "2567790", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567790"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-412", "details": ["A flaw was found in filelock. On Windows systems, soft lock implementations perform file operations that wait indefinitely when another process holds an opportunistic lock (oplock) on an unheld lock marker file. A local user with read access to the marker file can request an oplock and leave break requests unanswered, causing subsequent lock acquisition attempts to stall past configured timeouts. This issue allows an attacker to cause a Denial of Service (DoS) by preventing applications from obtaining required locks."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-112907", "package_state": [{"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Fix deferred", "package_name": "rhoai/odh-mlflow-rhel9", "product_name": "Red Hat OpenShift AI (RHOAI)"}], "public_date": "2026-11-05T21:50:04Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-112907\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-112907\nhttps://github.com/tox-dev/filelock/commit/97d694a9a3ee1721d6c79a480174dfd9b060a080\nhttps://github.com/tox-dev/filelock/commit/e1e825b1992f69fb6b346dc395d5ae4893536c0a\nhttps://github.com/tox-dev/filelock/pull/835\nhttps://github.com/tox-dev/filelock/releases/tag/4.2.1\nhttps://github.com/tox-dev/filelock/security/advisories/GHSA-567q-5qvw-pf92"], "statement": "This vulnerability is rated as Low severity because it exclusively targets Windows-specific opportunistic locking (oplock) behavior, posing no direct threat to Linux environments. Red Hat enterprise products and container deployments execute on Linux platforms utilizing standard POSIX file locking APIs rather than Windows path-handling semantics. Because the underlying opportunistic lock mechanism and affected system calls are absent on Linux, Red Hat environments are not affected by this denial of service.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.22.0,4.2.1)"}}], "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": "2026-11-05T23:45:07.427340+00:00", "updated": "2026-11-06T13:30:05.088031+00:00", "vendors": ["tox-dev", "tox-dev$PRODUCT$filelock"], "weaknesses": ["CWE-412", "CWE-667"]}