{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-91479", "assignerOrgId": "43595867-4340-4103-b7a2-9a5208d29a85", "state": "PUBLISHED", "assignerShortName": "oracle", "dateReserved": "2026-09-14T22:10:16.637Z", "datePublished": "2026-10-20T21:26:10.802Z", "dateUpdated": "2026-10-20T21:26:10.802Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "43595867-4340-4103-b7a2-9a5208d29a85", "shortName": "oracle", "dateUpdated": "2026-10-20T21:26:10.802Z"}, "problemTypes": [{"descriptions": [{"lang": "en-US", "description": "Easily exploitable vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the RDBMS executes to compromise RDBMS. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of RDBMS."}]}], "affected": [{"vendor": "Oracle Corporation", "product": "Oracle Database Server", "versions": [{"version": "23.4.0", "status": "affected", "lessThanOrEqual": "23.26.3", "versionType": "custom"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:oracle:database_-_rdbms:*:*:*:*:*:*:*:*", "versionStartIncluding": "23.4.0", "versionEndIncluding": "23.26.3"}]}]}], "descriptions": [{"lang": "en-US", "value": "Vulnerability in the RDBMS component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the RDBMS executes to compromise RDBMS. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of RDBMS. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."}], "references": [{"url": "https://www.oracle.com/security-alerts/cpuoct2026.html", "name": "Oracle Advisory", "tags": ["vendor-advisory"]}], "metrics": [{"cvssV3_1": {"attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM"}}]}}}

{}

{"affected": [{"affectedData": [{"product": "Oracle Database Server", "vendor": "Oracle Corporation", "versions": [{"lessThanOrEqual": "23.26.3", "status": "affected", "version": "23.4.0", "versionType": "custom"}]}], "source": "secalert_us@oracle.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Vulnerability in the RDBMS component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with access to the physical communication segment attached to the hardware where the RDBMS executes to compromise RDBMS. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of RDBMS. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)."}], "id": "CVE-2026-91479", "lastModified": "2026-10-21T18:44:55.490", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "secalert_us@oracle.com", "type": "Primary"}]}, "published": "2026-10-20T22:20:51.460", "references": [{"source": "secalert_us@oracle.com", "url": "https://www.oracle.com/security-alerts/cpuoct2026.html"}], "sourceIdentifier": "secalert_us@oracle.com", "vulnStatus": "Awaiting Analysis"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "product": "database_-_rdbms", "vendor": "oracle"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[23.4.0,23.26.3]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Oracle Database Server", "source": "cna", "vendor": "Oracle Corporation"}, "product": "database_server", "vendor": "oracle"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[23.4.0,23.26.3]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Oracle Database Server", "source": "cna", "vendor": "Oracle Corporation"}, "product": "oracle_database_server", "vendor": "oracle_corporation"}], "created": "2026-10-21T13:00:04.546003+00:00", "title": "Unauthenticated Physical Layer Exploit Allowing Denial of Service on Oracle Database Server", "updated": "2026-10-21T16:30:06.089574+00:00", "vendors": ["oracle", "oracle$PRODUCT$database_-_rdbms", "oracle$PRODUCT$database_server", "oracle_corporation", "oracle_corporation$PRODUCT$oracle_database_server"], "weaknesses": ["CWE-400", "CWE-730"]}