CVE-2026-21723
Medium · 5.3CVSS
5.3
EPSS
0.2%
Published
Jul 23, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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