Security Advisory
CVE-2026-21723
5.3
MEDIUM
Vulnerability 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.
Published Date
July 23, 2026
Official Source
NIST NVD Advisory