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Review reviewHigh

CVE-2026-8609

Grafana Grafana OSS, grafana

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
7.5
EPSS
0.40%
31.9% percentile
CISA KEV
Not listed
Published
2026.07.11
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.40%
Technical severityCVSS 7.5

Vulnerability overview

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).

Affected product and versions

Product
Grafana Grafana OSS, grafana
Affected versions
>= 11.6.0 <= 11.6.14, >= 12.2.0 <= 12.2.8, >= 12.3.0 <= 12.3.6, >= 12.4.0 <= 12.4.3, >= 13.0.0 <= 13.0.1, >= 11.6.0 < 11.6.15, >= 12.2.0 < 12.2.9, >= 12.3.0 < 12.3.7, >= 12.4.0 < 12.4.4, >= 13.0.0 < 13.0.2
Fixed versions
11.6.15, 12.2.9, 12.3.7, 12.4.4, 13.0.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Grafana Grafana OSS, grafana and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-400