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CVE-2026-21723

Estado: AplazadaMedia (5.3)—

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.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Grafana — GrafanaAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-21723",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-21723",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-07-23T14:15:50.650728Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@grafana.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.3,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.6
      }
    ]
  },
  "affected": [
    {
      "source": "security@grafana.com",
      "affectedData": [
        {
          "vendor": "Grafana",
          "product": "Grafana OSS",
          "versions": [
            {
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver",
              "lessThanOrEqual": "11.0.0"
            },
            {
              "status": "affected",
              "version": "11.0.0",
              "versionType": "semver",
              "lessThanOrEqual": "11.6.10"
            },
            {
              "status": "affected",
              "version": "12.0.0",
              "versionType": "semver",
              "lessThanOrEqual": "12.0.9"
            },
            {
              "status": "affected",
              "version": "12.1.0",
              "versionType": "semver",
              "lessThanOrEqual": "12.1.6"
            },
            {
              "status": "affected",
              "version": "12.2.0",
              "versionType": "semver",
              "lessThanOrEqual": "12.2.4"
            },
            {
              "status": "affected",
              "version": "12.3.0",
              "versionType": "semver",
              "lessThanOrEqual": "12.3.2"
            }
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-07-23T03:16:30.000",
  "references": [
    {
      "url": "https://grafana.com/security/security-advisories/cve-2026-21723",
      "source": "security@grafana.com"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ]
    }
  ],
  "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."
    }
  ],
  "lastModified": "2026-07-23T17:55:03.860",
  "sourceIdentifier": "security@grafana.com"
}