Medium severity · published Jul 23, 2026
CVE-2026-21723
CVE-2026-21723 Record
5.3
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
8.0.0 through 11.0.0; 11.0.0 through 11.6.10; 12.0.0 through 12.0.9; 12.1.0 through 12.1.6; 12.2.0 through 12.2.4; 12.3.0 through 12.3.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21723
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21723
grafana.com
https://grafana.com/security/security-advisories/cve-2026-21723
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