High severity · published Jul 10, 2026
CVE-2026-8609
Pre-authentication denial of service via the OAuth login route
7.5
CVSS
0.4%
EPSS
No
On KEV
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).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GR
Grafana · Grafana
11.6.0 through 11.6.14; 12.2.0 through 12.2.8; 12.3.0 through 12.3.6; 12.4.0 through 12.4.3; 13.0.0 through 13.0.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-8609
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-8609
Vendor Advisory
https://grafana.com/security/security-advisories/cve-2026-8609
More from Grafana
7.5
CVE-2021-43798
Grafana path traversal
7.3
CVE-2021-39226
Snapshot authentication bypass in grafana
9.8
CVE-2025-41115
SCIM provisioning was introduced in Grafana Enterprise and Grafana Cloud in April to improve how organizations manage users and teams in Grafana by introducing automated user…
9.8
CVE-2023-3128
Grafana is validating Azure AD accounts based on the email claim
9.8
CVE-2022-28660
The querier component in Grafana Enterprise Logs 1.1.x through 1.3.x before 1.4.0 does not require authentication when X-Scope-OrgID is used