CVE-2026-21723

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CVSS 3.1

5.3 medium

EPSS

<1%p26

Published

Jul 23, 2026 (Jul 23, 2026)

Modified

Jul 23, 2026

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.

Weakness: CWE-400
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.3%)

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