What’s Vulnerable › Vulnerabilities
CVE-2026-8609: Pre-authentication denial of service via the OAuth login route
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-10 · updated 2026-10-25
- Weakness: CWE-400
Description
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: from 11.6.0 before 11.6.15; from 12.2.0 before 12.2.9; from 12.3.0 before 12.3.7; from 12.4.0 before 12.4.4; from 13.0.0 before 13.0.2 — fixed in 11.6.15, 12.2.9, 12.3.7, 12.4.4, 13.0.2
How to fix
Upgrade to a fixed version: Grafana 11.6.15, 12.2.9, 12.3.7, 12.4.4. Check the vendor advisory for mitigations.
References
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