CVE-2026-8609: Grafana

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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).

Affected products

• Grafana Grafana: from 11.6.0, before 11.6.15 (fixed in 11.6.15); from 12.2.0, before 12.2.9 (fixed in 12.2.9); from 12.3.0, before 12.3.7 (fixed in 12.3.7); from 12.4.0, before 12.4.4 (fixed in 12.4.4); from 13.0.0, before 13.0.2 (fixed in 13.0.2)

Published 2026-07-10. Last modified 2026-07-13.