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

What is CVE-2026-8609?

CVE-2026-8609 is a medium-severity denial of service vulnerability in Grafana Grafana, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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).

Weakness: CWE-400

Which versions are affected by CVE-2026-8609?

1 open source package ship an affected version, including grafana. It affects 1 product.

Products include Grafana Grafana.

How do I fix CVE-2026-8609?

Upgrade grafana to a fixed version for your release line: 11.6.15, 12.2.9, 12.3.7 or 12.4.4.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-8609 being exploited?

There is no known exploitation of CVE-2026-8609 in the wild and no public exploit code.

Other vulnerabilities in Grafana Grafana

• CVE-2021-43798 Grafana Path Traversal Exploited High 7.5
• CVE-2025-41115 Incorrect privilege assignment Critical 10.0
• CVE-2022-39328 Grafana vulnerable to race condition allowing privilege escalation Critical 9.8
• CVE-2022-28660 Auth bypass in n/a Critical 9.8
• CVE-2022-26148 Information disclosure in n/a Critical 9.8

All Grafana Grafana vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-grafana-2026-8609, GHSA-j7jj-549c-j492, MINI-49w2-gq5f-8mqm, MINI-6m78-q7vr-q9pr, MINI-6v5q-pgwg-75mp, MINI-6xvr-pj8q-2x26 and 6 more.