CVE-2026-21723

Name of the Vulnerable Software and Affected Versions Grafana (affected versions not specified)

Description The alertmanager templates test endpoint '/api/alertmanager/grafana/config/api/v1/templates/test' allows the execution of templates without memory limits. Sending a large volume of template execution requests in a short timeframe can lead to Out of Memory (OOM) conditions, causing the Grafana service to crash. This issue is exploitable when anonymous access is enabled, as the endpoint requires very low privileges.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.