What is CVE-2026-21723?

CVE-2026-21723 is a medium-severity vulnerability in Grafana Oss, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-07-23.

How severe is CVE-2026-21723?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Grafana Oss

CVE-2026-21723

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 endpo…

Vulnerability class: DoS (Denial of Service)

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Grafana Oss — versions 8.0.0, 11.0.0, 12.0.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

security@grafana.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-21723?: CVE-2026-21723 is a medium-severity vulnerability in Grafana Oss, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-07-23.
How severe is CVE-2026-21723?: Medium severity. CVSS v3 base score is 5.3 out of 10.