CVE-2026-21998

{
  "id": "CVE-2026-21998",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-21T21:16:24.863",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).  Supported versions that are affected are 8.0.0-8.0.45, 8.4.0-8.4.8 and  9.0.0-9.6.0. 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: Server: Optimizer). Versiones compatibles que están afectadas son 8.0.0-8.0.45, 8.4.0-8.4.8 y 9.0.0-9.6.0. Vulnerabilidad fácilmente explotable permite a 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 de 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)."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Oracle Corporation",
          "product": "MySQL Server",
          "versions": [
            {
              "version": "8.0.0",
              "lessThanOrEqual": "8.0.45",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "8.4.0",
              "lessThanOrEqual": "8.4.8",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "9.0.0",
              "lessThanOrEqual": "9.6.0",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "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
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-22T14:03:29.125075Z",
          "id": "CVE-2026-21998",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "8.0.0",
              "versionEndIncluding": "8.0.45",
              "matchCriteriaId": "523E15F1-A21A-4D5D-82D5-2EB73B972AD9"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "8.4.0",
              "versionEndIncluding": "8.4.8",
              "matchCriteriaId": "427409D3-F331-4EA0-BEB7-F95594E81B2B"
            },
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "9.0.0",
              "versionEndIncluding": "9.6.0",
              "matchCriteriaId": "3CFD5AEC-ACAB-4F9E-8668-87A0CBD186CB"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://www.oracle.com/security-alerts/cpuapr2026.html",
      "source": "[email protected]",
      "tags": [
        "Vendor Advisory"
      ]
    }
  ]
}