CVE-2026-21723: CVE-2026-21723 Record

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-23 · updated 2026-10-24
Weakness: CWE-400

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.

Affected products

Grafana: from 8.0.0 through 11.0.0; from 11.0.0 through 11.6.10; from 12.0.0 through 12.0.9; from 12.1.0 through 12.1.6; from 12.2.0 through 12.2.4; from 12.3.0 through 12.3.2

References

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

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