What is CVE-2026-8609?

CVE-2026-8609 is a medium-severity vulnerability in Grafana, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-07-10.

How severe is CVE-2026-8609?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Grafana

CVE-2026-8609

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).

Vulnerability class: DoS (Denial of Service)

Published 2026-07-10 · last modified 2026-07-13.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (39.6th percentile), scored 2026-10-12.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001

Affected products

Grafana
Grafana Oss — versions 11.6.0, 12.2.0, 12.3.0

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

grafana.com/security/security-advisories/cve-2026-8609 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8609?: CVE-2026-8609 is a medium-severity vulnerability in Grafana, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-07-10.
How severe is CVE-2026-8609?: Medium severity. CVSS v3 base score is 5.3 out of 10.