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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-22 · updated 2026-07-10
Weakness: CWE-400

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.

Affected products

Grafana: 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

References

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

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