PT-2026-63565 · Grafana · Grafana Oss

Nacl · CVE-2026-21723 · Published 2026-07-23 · Updated 2026-07-23

Mitre

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Related Identifiers

CVE-2026-21723

Affected Products

Grafana Oss

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-21723 · Security Note
• https://grafana.com/security/security-advisories/cve-2026-21723 · Vendor Advisory