CVE-2026-21723
MEDIUM
NVD
CVSS Score
5.3
Severity
MEDIUM
Published
Jul 23, 2026
Vendor
unknown
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.