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CVE-2026-21720 Unauthenticated DoS: avatar cache leaks goroutines when /avatar/:hash requests time out

🗓️ 27 Jan 2026 09:07:04Reported by GRAFANAType 
cvelist
 cvelist
🔗 www.cve.org👁 57 Views

Unauthenticated DoS: avatar requests spawn leaking goroutines on timeouts, exhausting memory and Grafana.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-21720
27 Jan 202609:07
–attackerkb
alpinelinux
AlpineLinux
CVE-2026-21720
27 Jan 202609:07
–alpinelinux
bdu_fstec
BDU FSTEC
Grafana Monitoring Resource Consumption DoS
25 Mar 202600:00
–bdu_fstec
cgr
Chainguard
CVE-2026-21720 vulnerabilities
25 Feb 202613:17
–cgr
circl
Circl
CVE-2026-21720
27 Jan 202610:00
–circl
cnnvd
CNNVD
Grafana security vulnerabilities
27 Jan 202600:00
–cnnvd
cve
CVE
CVE-2026-21720
27 Jan 202609:07
–cve
euvd
EUVD
EUVD-2026-4841
27 Jan 202609:07
–euvd
grafana
Grafana
Unauthenticated DoS in avatar cache in Grafana
27 Jan 202600:00
–grafana
nessus
Tenable Nessus
Grafana Labs 3.0.0 < 11.6.9+security-01 / 12.0.0 < 12.0.8+security-01 / 12.1.0 < 12.1.5+security-01 / 12.2.0 < 12.2.3+security-01 / 12.3.0 < 12.3.1+security-01 DoS (CVE-2026-21720)
30 Jan 202600:00
–nessus
Rows per page
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    "product": "grafana/grafana-enterprise",
    "defaultStatus": "unaffected",
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        "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",
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    "defaultStatus": "unaffected",
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    "defaultStatus": "unaffected",
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    ]
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  {
    "vendor": "Grafana",
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    "defaultStatus": "unaffected",
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      {
        "version": "3.0.0",
        "status": "affected",
        "versionType": "semver",
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      }
    ]
  },
  {
    "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"
      }
    ]
  }
]

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