CVE-2026-21723

{
  "id": "CVE-2026-21723",
  "sourceIdentifier": "[email protected]",
  "published": "2026-07-23T03:16:30.000",
  "lastModified": "2026-10-24T13:10:00.147",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled."
    },
    {
      "lang": "es",
      "value": "El endpoint de prueba de plantillas de alertmanager (/API/alertmanager/grafana/config/API/v1/templates/test) puede ejecutar plantillas sin límites de memoria. La ejecución masiva de plantillas en un corto período provoca OOM y la caída del servicio de Grafana. El endpoint requiere privilegios muy bajos y es explotable con el acceso anónimo habilitado."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Grafana",
          "product": "Grafana OSS",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8.0.0",
              "lessThanOrEqual": "11.0.0",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "11.0.0",
              "lessThanOrEqual": "11.6.10",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "12.0.0",
              "lessThanOrEqual": "12.0.9",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "12.1.0",
              "lessThanOrEqual": "12.1.6",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "12.2.0",
              "lessThanOrEqual": "12.2.4",
              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "12.3.0",
              "lessThanOrEqual": "12.3.2",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 3.6
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-07-23T14:15:50.650728Z",
          "id": "CVE-2026-21723",
          "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"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://grafana.com/security/security-advisories/cve-2026-21723",
      "source": "[email protected]"
    }
  ]
}