GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-21968 (GCVE-0-2026-21968)

Vulnerability from cvelistv5 – Published: 2026-01-20 21:56 – Updated: 2026-01-21 19:21
VLAI
Summary
Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). 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 low 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 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-21 19:20 UTC
CWE
  • Easily exploitable vulnerability allows low 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.
  • CWE-noinfo Not enough information
Assigner
References
Impacted products
Vendor Product Version CPE status
Oracle Corporation MySQL Server Affected: 8.0.0 , ≤ 8.0.44 (custom)
Affected: 8.4.0 , ≤ 8.4.7 (custom)
Affected: 9.0.0 , ≤ 9.5.0 (custom)
    cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
    cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21968",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-21T19:20:23.657459Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-21T19:21:31.349Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "MySQL Server",
          "vendor": "Oracle Corporation",
          "versions": [
            {
              "lessThanOrEqual": "8.0.44",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "8.4.7",
              "status": "affected",
              "version": "8.4.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.5.0",
              "status": "affected",
              "version": "9.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "8.0.44",
                  "versionStartIncluding": "8.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "8.4.7",
                  "versionStartIncluding": "8.4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.5.0",
                  "versionStartIncluding": "9.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).  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 low 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 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Easily exploitable vulnerability allows low 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.",
              "lang": "en-US"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-20T21:56:34.542Z",
        "orgId": "43595867-4340-4103-b7a2-9a5208d29a85",
        "shortName": "oracle"
      },
      "references": [
        {
          "name": "Oracle Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.oracle.com/security-alerts/cpujan2026.html"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "43595867-4340-4103-b7a2-9a5208d29a85",
    "assignerShortName": "oracle",
    "cveId": "CVE-2026-21968",
    "datePublished": "2026-01-20T21:56:34.542Z",
    "dateReserved": "2026-01-05T18:07:34.714Z",
    "dateUpdated": "2026-01-21T19:21:31.349Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-21968",
      "date": "2026-09-13",
      "epss": "0.00273",
      "percentile": "0.19595"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-21968\",\"sourceIdentifier\":\"secalert_us@oracle.com\",\"published\":\"2026-01-20T22:15:59.853\",\"lastModified\":\"2026-06-17T10:19:15.203\",\"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 8.0.0-8.0.44, 8.4.0-8.4.7 and  9.0.0-9.5.0. Easily exploitable vulnerability allows low 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 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/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). Las versiones compatibles afectadas son 8.0.0-8.0.44, 8.4.0-8.4.7 y 9.0.0-9.5.0. La vulnerabilidad f\u00e1cilmente explotable permite a un atacante con pocos privilegios y acceso a la red a trav\u00e9s de m\u00faltiples protocolos comprometer MySQL Server. Los ataques exitosos de esta vulnerabilidad pueden resultar en la capacidad no autorizada de causar un bloqueo o una ca\u00edda frecuentemente repetible (DoS completo) de MySQL Server. Puntuaci\u00f3n Base CVSS 3.1 6.5 (Impactos en la disponibilidad). Vector CVSS: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).\"}],\"affected\":[{\"source\":\"secalert_us@oracle.com\",\"affectedData\":[{\"vendor\":\"Oracle Corporation\",\"product\":\"MySQL Server\",\"versions\":[{\"version\":\"8.0.0\",\"lessThanOrEqual\":\"8.0.44\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"8.4.0\",\"lessThanOrEqual\":\"8.4.7\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"9.0.0\",\"lessThanOrEqual\":\"9.5.0\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secalert_us@oracle.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-21T19:20:23.657459Z\",\"id\":\"CVE-2026-21968\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"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_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\":\"secalert_us@oracle.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-08T22:22:03+00:00",
      "cve": "CVE-2026-21968",
      "id": "CVE-2026-21968",
      "initial_release_date": "2026-01-20T00:00:00+00:00",
      "product_status:fixed": "824",
      "product_status:known_affected": "31",
      "product_status:known_not_affected": "9",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "mysql: Optimizer unspecified vulnerability (CPU Jan 2026)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21968.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-21968\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-21T19:20:23.657459Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"description\": \"CWE-noinfo Not enough information\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-21T19:20:40.829Z\"}}], \"cna\": {\"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Oracle Corporation\", \"product\": \"MySQL Server\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.0.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"8.0.44\"}, {\"status\": \"affected\", \"version\": \"8.4.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"8.4.7\"}, {\"status\": \"affected\", \"version\": \"9.0.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"9.5.0\"}]}], \"references\": [{\"url\": \"https://www.oracle.com/security-alerts/cpujan2026.html\", \"name\": \"Oracle Advisory\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer).  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 low 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 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"description\": \"Easily exploitable vulnerability allows low 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.\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"8.0.44\", \"versionStartIncluding\": \"8.0.0\"}, {\"criteria\": \"cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"8.4.7\", \"versionStartIncluding\": \"8.4.0\"}, {\"criteria\": \"cpe:2.3:a:oracle:mysql_server:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.5.0\", \"versionStartIncluding\": \"9.0.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"43595867-4340-4103-b7a2-9a5208d29a85\", \"shortName\": \"oracle\", \"dateUpdated\": \"2026-01-20T21:56:34.542Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21968\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-21T19:21:31.349Z\", \"dateReserved\": \"2026-01-05T18:07:34.714Z\", \"assignerOrgId\": \"43595867-4340-4103-b7a2-9a5208d29a85\", \"datePublished\": \"2026-01-20T21:56:34.542Z\", \"assignerShortName\": \"oracle\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.