CVE-2026-21723

Published: Jul 23, 2026Modified: Oct 24, 2026Deferred

5.3

Vector

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

Exploitability: 1.6 / Impact: 3.6

Source: security@grafana.com (Secondary)

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.

Related CWEs

CWE-400

Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

References (1)

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

Source: security@grafana.com

Timeline

No history available yet.