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Vulnerabilities CVE-2026-21723

CVE-2026-21723

Medium
Open
TLP:CLEAR

CVE-2026-21723 Record

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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.

Details

CVSS Score
5.3
EPSS Score
0.20%

9.8th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jul 23, 2026
Last Modified
Aug 11, 2026
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