Pre-authentication denial of service in the OAuth login route
Medium
| Advisory ID: | CVE-2026-8609 |
| Published: | 2026-06-09 |
| Product: | Grafana |
| CVSS Score: | 5.3 |
| CVSS Vector: | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Fixed Versions: | >=11.6.15 >=12.2.9 >=12.3.7 >=12.4.4 >=13.0.2 |
Summary
An unauthenticated attacker can repeatedly call Grafana’s OAuth login route with unique values, causing unbounded memory growth that can eventually exhaust memory and crash the Grafana instance (denial of service). Upgrade to a fixed version listed below.