CVE-2026-8609 PUBLISHED

Pre-authentication denial of service via the OAuth login route

Assigner: GRAFANA
Reserved: 14.05.2026 Published: 10.07.2026 Updated: 10.07.2026

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).

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	Grafana
Product	Grafana OSS
Versions	Default: unaffected affected from 11.6.0 to 11.6.14 (incl.) affected from 12.2.0 to 12.2.8 (incl.) affected from 12.3.0 to 12.3.6 (incl.) affected from 12.4.0 to 12.4.3 (incl.) affected from 13.0.0 to 13.0.1 (incl.)

Credits

cyberjoker (Researcher) finder

References

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

Problem Types

CWE-400 CWE