CVE-2026-21723

MEDIUM CVSS 5.3 View on NVD ↗

Description

The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits. Mass-executing templates in a short period causes OOM and crashes the Grafana service. The endpoint requires very low privileges and is exploitable with anonymous access enabled.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References

https://grafana.com/security/security-advisories/cve-2026-21723

Published: Jul 23, 2026 03:16 UTC Modified: Jul 23, 2026 17:55 UTC