Resource exhaustion in Grafana - CVE-2026-21723
Published: July 24, 2026 / Updated: July 24, 2026
Vulnerability identifier: #VU139271
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21723
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Grafana Labs
Affected software:
Grafana
Grafana
Detailed vulnerability description
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the alertmanager templates test endpoint when executing templates without memory limits. A remote user can send a large number of template execution requests to cause a denial of service.
Anonymous access must be enabled for unauthenticated exploitation.
How to mitigate CVE-2026-21723
Install security update from vendor's website.