Medium 5.3Published Jul 10, 2026

CVE-2026-8609Pre-authentication denial of service via the OAuth login route

Updated under an hour ago (Oct 27, 2026, 4:40 AM ET)

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It affects Grafana OSS and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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).

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GRAFANA
NVD analysis: Analyzed
Record last updated: Aug 27, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Grafana Grafana OSS grafana:oss (from the name)	from 11.6.0 through 11.6.14; from 12.2.0 through 12.2.8; from 12.3.0 through 12.3.6; from 12.4.0 through 12.4.3; from 13.0.0 through 13.0.1	CNA record
grafana grafana grafana: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	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.