Pre-authentication denial of service via the OAuth login route

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Summary

CVECVE-2026-8609
StatePUBLISHED
AssignerGRAFANA
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-10 16:16:39 UTC
Updated2026-07-10 17:17:04 UTC
DescriptionAn 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).

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-400 | CWE-400 CWE-400 | CWE-400 CWE-400 Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Grafana Grafana OSS affected 11.6.0 11.6.14 semver Not specified
CNA Grafana Grafana OSS affected 12.2.0 12.2.8 semver Not specified
CNA Grafana Grafana OSS affected 12.3.0 12.3.6 semver Not specified
CNA Grafana Grafana OSS affected 12.4.0 12.4.3 semver Not specified
CNA Grafana Grafana OSS affected 13.0.0 13.0.1 semver Not specified

References

ReferenceSourceLinkTags
grafana.com/security/security-advisories/cve-2026-8609 [email protected] grafana.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: cyberjoker (Researcher) (en)

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