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.

INFO

Published Date :

2026-01-27T09:07:04.758Z

Last Modified :

2026-04-24T08:00:48.727Z

Source :

GRAFANA
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21720 vulnerability.

Vendors Products
Grafana
  • Grafana
  • Grafana Enterprise
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21720.

URL Resource
https://grafana.com/security/security-advisories/CVE-2026-21720 cve-icon cve-icon
https://grafana.com/security/security-advisories/cve-2026-21720 cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-21720 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-21720 cve-icon
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