Denial of service via unbounded request body size
Several Grafana API endpoints, some of them unauthenticated, do not limit the size of the request body before processing it.
Red Hat Hardened Images RPMs bug fix and enhancement update
Released 2026-09-08 · Red Hat rating Important · View on Red Hat →
Several Grafana API endpoints, some of them unauthenticated, do not limit the size of the request body before processing it.
An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service).
An authenticated user with permission to create or edit alert rules can bypass datasource query authorization by marking an alert rule query as a server-side expression while referencing a real datasource UID (incorrect…
Note: The CVE and blog post don't exist because we determined this is actually a cloud-only issue.
A user with Editor permissions can craft a dashboard whose table (TableNG) panel contains a malicious field name that executes as a script in the browser of any user who views the dashboard (stored cross-site scripting).
An authenticated attacker with Editor access or alert.instances.external:write can submit an external Alertmanager alert containing a controlled generatorURL.
The alertmanager templates test endpoint (/api/alertmanager/grafana/config/api/v1/templates/test) can execute templates with no memory limits.