CVE-2026-8609: An unauthenticated attacker can repeatedly call Grafana's OAuth login route with unique values, causing unboun

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-8609 is a medium-severity flaw (CVSS 5.3) affecting grafana. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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).

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-400
Published	2026-07-10
Last modified	2026-10-25

Publisher (CNA): Grafana Labs · Vendor: grafana

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-10 16:16 UTCPublished CVE record published
2026-10-25 15:10 UTCUpdated Record last modified

grafana grafana UPGRADE

Affected: >= 11.6.0 and < 11.6.15 · >= 12.2.0 and < 12.2.9 · >= 12.3.0 and < 12.3.7 · >= 12.4.0 and < 12.4.4 · >= 13.0.0 and < 13.0.2

Fixed in: 11.6.15, 12.2.9, 12.3.7, 12.4.4, 13.0.2

Safe to downgrade to: a release before 11.6.0

1. Check installed version

apt-cache policy grafana || rpm -q grafana || grafana --version

2. UPGRADE to 11.6.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade grafana

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade grafana

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 11.6.0 (Debian / Ubuntu)

apt-cache madison grafana sudo apt install grafana=<VERSION_BEFORE_11.6.0> sudo apt-mark hold grafana

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list grafana sudo dnf downgrade grafana-<VERSION_BEFORE_11.6.0> sudo dnf versionlock add grafana

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8609?

grafana: upgrade to 11.6.15, 12.2.9, 12.3.7, 12.4.4, 13.0.2. Exact commands for each OS are on this page.

Is CVE-2026-8609 being exploited?

CVE-2026-8609 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8609 affect?

CVE-2026-8609 affects grafana. Severity is medium (CVSS 5.3). 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).

How urgent is CVE-2026-8609?

Priority 32/100. Remotely exploitable, no login, no user action

Software pages

Grafana vulnerabilities

Related CVEs

CVE-2026-33382 HIGH 7.5 UPGRADE Several Grafana API endpoints, some of them unauthenticated, do not limit the size of the request body before
CVE-2026-8595 MEDIUM 6.8 UPGRADE A user with Editor permissions can craft a dashboard whose table (TableNG) panel contains a malicious field na

References

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