CVE-2026-42127 — Vulnerability in github.com/grafana/grafana — CVE...

HIGH

Grafana: Pre-authentication denial of service in the public dashboard query handler

Published June 22, 2026Updated September 28, 2026Source: osv

Summary

The public dashboard query endpoint does not limit request body size before processing, allowing unauthenticated attackers to trigger excessive memory allocation by sending arbitrarily large JSON payloads. This can lead to denial of service through memory exhaustion. No valid dashboard access token or authentication is required to exploit this vulnerability.

Advisory Timeline

First published June 22, 2026 (112 days ago).
Last revised September 28, 2026 — 98 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Update github.com/grafana/grafana to 1.9.2-0.20260616075434-82ef13993059 or later

go get github.com/grafana/grafana@v1.9.2-0.20260616075434-82ef13993059

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (6)

Affects 1 ecosystem: go (1).

Package	Ecosystem	Affected	Fixed In
github.com/grafana/grafana	go	All versions	Range-based data available
github.com/grafana/grafana	go	All versions	Range-based data available
github.com/grafana/grafana	go	All versions	1.9.2-0.20260616075434-82ef13993059
github.com/grafana/grafana	go	All versions	Range-based data available
github.com/grafana/grafana	go	All versions	Range-based data available
github.com/grafana/grafana	go	All versions	Range-based data available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-400
Uncontrolled Resource ConsumptionMITRE
CWE-770
Allocation of Resources Without LimitsMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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

References

Frequently Asked Questions

What is CVE-2026-42127?: Grafana: Pre-authentication denial of service in the public dashboard query handler This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-42127?: CVE-2026-42127 affects github.com/grafana/grafana. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-42127 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-3w66-95m3-8jxg

BIT-grafana-2026-42127

GO-2026-6541

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