Pre-authentication denial of service in the public dashboard query endpoint (CVE-2026-42127) | HOL Guard CVE

High · CVSS 7.5CVE-2026-42127

Pre-authentication denial of service in the public dashboard query endpoint

Answer in brief

CVE-2026-42127 records a High severity (CVSS 7.5) vulnerability in Pre-authentication denial of service in the public dashboard query endpoint. The current sources do not mark it as known exploited. The current feed maps Grafana/Grafana Enterprise (generic), Grafana/Grafana OSS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 22, 2026Updated Aug 27, 2026Source checked Sep 20, 2026First seen by HOL Jun 22, 2026Material review Aug 27, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Grafana/Grafana Enterprise (generic), Grafana/Grafana OSS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Grafana/Grafana Enterprisegeneric	11.6.0 \|\| 12.2.0 \|\| 12.3.0 \|\| 12.4.0 \|\| 13.0.0	Not reported
Grafana/Grafana OSSgeneric	11.6.0 \|\| 12.2.0 \|\| 12.3.0 \|\| 12.4.0 \|\| 13.0.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Grafana/Grafana Enterprise, Grafana/Grafana OSS.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jun 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 22, 2026

Sources and claim methodology

Source referencegrafana.com

Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.