CVE-2026-21723

MediumCVSS 5.3/10Last modified Oct 24, 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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

Vendor	Product	Versions
Grafana	Grafana OSS	>= 8.0.0, <= 11.0.0; >= 11.0.0, <= 11.6.10; >= 12.0.0, <= 12.0.9; >= 12.1.0, <= 12.1.6; >= 12.2.0, <= 12.2.4; >= 12.3.0, <= 12.3.2

References

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

Timeline

Published: Jul 23, 2026
Last modified: Oct 24, 2026
NVD status: Deferred

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