CVE-2026-21723 PUBLISHED

CVE-2026-21723 Record

Assigner: GRAFANA
Reserved: 05.01.2026 Published: 23.07.2026 Updated: 23.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 5.3

Product Status

Vendor Grafana
Product Grafana OSS
Versions Default: unaffected
  • affected from 8.0.0 to 11.0.0 (incl.)
  • affected from 11.0.0 to 11.6.10 (incl.)
  • affected from 12.0.0 to 12.0.9 (incl.)
  • affected from 12.1.0 to 12.1.6 (incl.)
  • affected from 12.2.0 to 12.2.4 (incl.)
  • affected from 12.3.0 to 12.3.2 (incl.)

Credits

  • nacl (Researcher) finder

References