CVE-2026-42127Network attack vector

Pre-authentication service interruption via oversized JSON payloads

Published Jun 22, 2026 · Updated Jun 22, 2026

Resource exhaustion in affected Grafana Enterprise and Grafana OSS releases allows remote attackers to interrupt service without authentication. The public dashboard query handler accepts an arbitrarily large JSON request body and processes it without a size limit, causing excessive memory allocation. No dashboard access token or other authentication is required, and memory exhaustion can make the Grafana service unavailable.

CVSS severity7.5
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource exhaustion in affected Grafana Enterprise and Grafana OSS releases allows remote attackers to interrupt service without authentication. The public dashboard query handler accepts an arbitrarily large JSON request body and processes it without a size limit, causing excessive memory allocation. No dashboard access token or other authentication is required, and memory exhaustion can make the Grafana service unavailable.

The record

CVE
CVE-2026-42127
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Grafana Labs
Product
Grafana OSS
Classifications
CWE-400, CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=11.6.0 <=11.6.14
  2. Affected versionversion=12.2.0 <=12.2.8
  3. Affected versionversion=12.3.0 <=12.3.6
  4. Affected versionversion=12.4.0 <=12.4.3
  5. Affected versionversion=13.0.0 <=13.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grafana Labs · Grafana OSSversion=11.6.0 <=11.6.14; version=12.2.0 <=12.2.8; version=12.3.0 <=12.3.6; version=12.4.0 <=12.4.3; version=13.0.0 <=13.0.1
Grafana Labs · Grafana Enterpriseversion=0 <=11.6.14; version=0 <=12.2.8; version=0 <=12.3.6; version=0 <=12.4.3; version=0 <=13.0.1

Published CVSS scores

7.5Grafana LabsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo