HIGHCVSS 7.5EPSS 0.4%

CVE-2026-42127

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

Published: 2026-06-22
Modified: 2026-09-21
EPSS percentile: 37%
Aliases: GHSA-3w66-95m3-8jxg
Sources: github-advisory

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.

Affected packages

Ecosystem	Package	Affected versions	Fixed versions
Go	github.com/grafana/grafana	—	1.9.2-0.20260616075434-82ef13993059

Remediation: Upgrade to 1.9.2-0.20260616075434-82ef13993059 or later.

References

https://github.com/advisories/GHSA-3w66-95m3-8jxg

Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.

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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.