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CVE-2026-21720

🗓️ 27 Jan 2026 09:07:04Reported by GRAFANAType 
cve
 cve
🔗 web.nvd.nist.gov👁 131 Views🌐 WEB

CVE-2026-21720: Unauthenticated DoS; avatar refresh goroutines leak after timeouts, exhausting memory and crashing Grafana.

Related
Detection
Affected
Refs
Paths
NVD
Node
OR
grafanagrafanaRange3.0.011.6.9-
grafanagrafanaRange3.0.011.6.9enterprise
grafanagrafanaRange12.0.012.0.8-
grafanagrafanaRange12.0.012.0.8enterprise
grafanagrafanaRange12.1.012.1.5-
grafanagrafanaRange12.1.012.1.5enterprise
grafanagrafanaRange12.2.012.2.3-
grafanagrafanaRange12.2.012.2.3enterprise
grafanagrafanaMatch12.3.0-
grafanagrafanaMatch12.3.0enterprise
[
  {
    "vendor": "Grafana",
    "product": "grafana/grafana-enterprise",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "11.6.9"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana-enterprise",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.0.8"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana-enterprise",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.1.5"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "11.6.9"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.0.8"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.1.5"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana-enterprise",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.2.3"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.2.3"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana-enterprise",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.3.1"
      }
    ]
  },
  {
    "vendor": "Grafana",
    "product": "grafana/grafana",
    "defaultStatus": "unaffected",
    "versions": [
      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
        "lessThan": "12.3.1"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
hashpath/avatar/:hashUncached /avatar/:hash requests spawn goroutines that refresh Gravatar images; timeout after 3 seconds causes goroutine to block and memory leak under sustained traffic, potentially crashing Grafana.CWE-703CWE-400CWE-772

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27 Aug 2026 17:22Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.17.5
EPSS0.00642
SSVC
131