CVE-2026-21723

CVE-2026-21723 Record

State: Published
Severity: 5.3 Medium
Published: Jul 23, 2026
Updated: Aug 27, 2026
Reserved: Jan 5, 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.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H	GRAFANA

Weaknesses

CWE-400 Uncontrolled Resource Consumption

Affected Products

Product	Versions
Grafana OSSGrafana	8.0.0 through 11.0.0Affected 11.0.0 through 11.6.10Affected 12.0.0 through 12.0.9Affected 12.1.0 through 12.1.6Affected 12.2.0 through 12.2.4Affected 12.3.0 through 12.3.2Affected

References

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

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