CVE-2026-8609

Pre-authentication denial of service via the OAuth login route

State: Published
Severity: 5.3 Medium
Published: Jul 10, 2026
Updated: Aug 27, 2026
Reserved: May 14, 2026

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).

Scores

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

Weaknesses

CWE-400

Affected Products

Product	Versions
Grafana OSSGrafana	11.6.0 through 11.6.14Affected 12.2.0 through 12.2.8Affected 12.3.0 through 12.3.6Affected 12.4.0 through 12.4.3Affected 13.0.0 through 13.0.1Affected

References

https://grafana.com/security/security-advisories/cve-2026-8609vendor-advisory

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