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CVE-2026-21720 high CVSS 7.5

Vulnerability in grafana (CVE-2026-21720)

Summary

Vulnerability in grafana (CVE-2026-21720). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1 or later.

Original description

The description as published by the source.

Every uncached /avatar/:hash request spawns a goroutine that refreshes the Gravatar image. If the refresh sits in the 10-slot worker queue longer than three seconds, the handler times out and stops listening for the result, so that goroutine blocks forever trying to send on an unbuffered channel. Sustained traffic with random hashes keeps tripping this timeout, so goroutine count grows linearly, eventually exhausting memory and causing Grafana to crash on some systems.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-21720 has been found in grafana.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade grafana to 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1 or later.
If unsure, ask your IT team or search "grafana CVE-2026-21720" on the vendor's site.

CVE-2026-21720 (grafana) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-400) exists in grafana.

📍 Affected scope

Check the vendor advisory for the affected versions of grafana.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'grafana' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'grafana' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で grafana を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade grafana to 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1

    ステージング環境で 11.6.9, 12.0.8, 12.1.5, 12.2.3, 12.3.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Bitnami grafana
[{"type":"SEMVER","events":[{"introduced":"3.0.0"},{"fixed":"11.6.9"},{"introduced":"12.0.0"},{"fixed":"12.0.8"},{"introduced":"12.1.0"},{"fixed":"12.1.5"},{"introduced":"12.2.0"},{"fixed":"12.2.3"},{"introduced":"12.3.0"},{"fixed":"12.3.1"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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