CVE-2026-21723 (GCVE-0-2026-21723)

Vulnerability from cvelistv5 – Published: 2026-07-23 01:48 – Updated: 2026-07-23 01:48
VLAI
Title
CVE-2026-21723 Record
Summary
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.
Assigner
References
Impacted products
Vendor Product Version
Grafana Grafana OSS Affected: 8.0.0 , ≤ 11.0.0 (semver)
Affected: 11.0.0 , ≤ 11.6.10 (semver)
Affected: 12.0.0 , ≤ 12.0.9 (semver)
Affected: 12.1.0 , ≤ 12.1.6 (semver)
Affected: 12.2.0 , ≤ 12.2.4 (semver)
Affected: 12.3.0 , ≤ 12.3.2 (semver)
Create a notification for this product.
Date Public
2026-07-22 01:42
Credits
nacl (Researcher)
Show details on NVD website

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    "cna": {
      "affected": [
        {
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          "product": "Grafana OSS",
          "vendor": "Grafana",
          "versions": [
            {
              "lessThanOrEqual": "11.0.0",
              "status": "affected",
              "version": "8.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "11.6.10",
              "status": "affected",
              "version": "11.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.0.9",
              "status": "affected",
              "version": "12.0.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.1.6",
              "status": "affected",
              "version": "12.1.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.2.4",
              "status": "affected",
              "version": "12.2.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "12.3.2",
              "status": "affected",
              "version": "12.3.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "nacl (Researcher)"
        }
      ],
      "datePublic": "2026-07-22T01:42:00.000Z",
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-23T01:48:16.245Z",
        "orgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
        "shortName": "GRAFANA"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://grafana.com/security/security-advisories/cve-2026-21723"
        }
      ],
      "source": {
        "discovery": "BUG_BOUNTY"
      },
      "title": "CVE-2026-21723 Record",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "57da9224-a3e2-4646-9d0e-c4dc2e05e7da",
    "assignerShortName": "GRAFANA",
    "cveId": "CVE-2026-21723",
    "datePublished": "2026-07-23T01:48:16.245Z",
    "dateReserved": "2026-01-05T09:26:06.214Z",
    "dateUpdated": "2026-07-23T01:48:16.245Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-21723",
      "date": "2026-07-23",
      "epss": "0.00327",
      "percentile": "0.25076"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-21723\",\"sourceIdentifier\":\"security@grafana.com\",\"published\":\"2026-07-23T03:16:30.000\",\"lastModified\":\"2026-07-23T03:16:30.000\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"security@grafana.com\",\"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\":\"security@grafana.com\",\"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}]},\"references\":[{\"url\":\"https://grafana.com/security/security-advisories/cve-2026-21723\",\"source\":\"security@grafana.com\"}]}}"
  }
}



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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.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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