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CVE-2026-8609

Pre-authentication denial of service via the OAuth login route

HIGH
7.5
CVSS Score
Published: July 10, 2026 at 02:58 PM UTC
Updated: October 25, 2026 at 03:10 PM UTC
1 product affected across 1 vendorGrafana

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Grafana· Grafana
95%
11.6.0 ≤ v < 11.6.1512.2.0 ≤ v < 12.2.912.3.0 ≤ v < 12.3.712.4.0 ≤ v < 12.4.413.0.0 ≤ v < 13.0.211.6.012.2.012.3.012.4.013.0.0
Affected range stops below 11.6.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.2.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.3.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.4.4, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.0.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://grafana.com/security/security-advisories/cve-2026-8609

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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