CVE-2026-21723
Published:July 23, 2026
Updated:August 06, 2026
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 Packages
github.com/grafana/grafana (GO):
Affected version(s) >=v12.1.0 <v12.1.7Fix Suggestion:
Update to version v12.1.7github.com/grafana/grafana (GO):
Affected version(s) >=v8.0.0 <v11.6.11Fix Suggestion:
Update to version v11.6.11github.com/grafana/grafana (GO):
Affected version(s) >=v12.2.0 <v12.2.5Fix Suggestion:
Update to version v12.2.5github.com/grafana/grafana (GO):
Affected version(s) >=v12.3.0 <v12.3.3Fix Suggestion:
Update to version v12.3.3github.com/grafana/grafana (GO):
Affected version(s) >=v12.0.0 <v12.0.10Fix Suggestion:
Update to version v12.0.10Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Resource Consumption
EPSS
Base Score:
0.20