CVE-2026-21720
7.5 · HIGHOverview
CVE-2026-21720 is a high-severity vulnerability affecting grafana grafana. It was published on January 27, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from grafana. Update grafana to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| grafana | grafana | >= 3.0.0, < 11.6.9 | Affected |
Frequently Asked Questions
What is CVE-2026-21720?
CVE-2026-21720 is a high-severity vulnerability affecting grafana grafana. It was published on January 27, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-21720?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-21720?
Check the references section for vendor advisories and patches from grafana. Update grafana to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-21720?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-21720 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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