CVE-2026-42127: Grafana Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-3w66-95m3-8jxg
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CVSS 7.5
CWE-400 CWE-770
Published
Advisory Summary

CVE-2026-42127 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Grafana libraries in the Go ecosystem. The issue involves pre-authentication denial of service in the public dashboard query handler. Remediation is available by upgrading affected packages to version 1.9.2-0.20260616075434-82ef13993059.

CVE-2026-42127 at a Glance

CVE Identifier CVE-2026-42127
GHSA Identifier GHSA-3w66-95m3-8jxg
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Grafana
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2026-42127

To remediate this vulnerability, upgrade all affected Grafana dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/grafana/grafana fixed: Latest secure release 
Upgrade github.com/grafana/grafana to Latest secure release
github.com/grafana/grafana fixed: Latest secure release 
Upgrade github.com/grafana/grafana to Latest secure release
github.com/grafana/grafana fixed: Latest secure release 
Upgrade github.com/grafana/grafana to Latest secure release
github.com/grafana/grafana fixed: Latest secure release 
Upgrade github.com/grafana/grafana to Latest secure release
github.com/grafana/grafana fixed: Latest secure release 
Upgrade github.com/grafana/grafana to Latest secure release
github.com/grafana/grafana fixed: 1.9.2-0.20260616075434-82ef13993059 
Upgrade github.com/grafana/grafana to 1.9.2-0.20260616075434-82ef13993059
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/grafana/grafana

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-42127, inspect your project dependencies for Grafana:

inspect dependencies for github.com/grafana/grafana

Analyze the terminal output to locate any version of Grafana in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.9.2-0.20260616075434-82ef13993059), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Grafana, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2026-42127 Affected Grafana Versions

6 component(s)
Fixed Versions:
1.9.2-0.20260616075434-82ef13993059
Product / Package Ecosystem Affected Versions Fixed Version
github.com/grafana/grafana
golang/github.com/grafana/grafana
Go
≥ 2.0.0-beta1
github.com/grafana/grafana
golang/github.com/grafana/grafana
Go
≥ 12.0.0
github.com/grafana/grafana
golang/github.com/grafana/grafana
Go
≥ 12.3.0
github.com/grafana/grafana
golang/github.com/grafana/grafana
Go
≥ 12.4.0
github.com/grafana/grafana
golang/github.com/grafana/grafana
Go
≥ 13.0.0
github.com/grafana/grafana
golang/github.com/grafana/grafana
Go
< 1.9.2-0.20260616075434-82ef13993059
1.9.2-0.20260616075434-82ef13993059

References

NVD — CVE-2026-42127 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42127
Grafana Source Repository REPOSITORY
https://github.com/grafana/grafana/pull/125789
Security Fix Commit FIX COMMIT
https://github.com/grafana/grafana/commit/82ef13993059351bf21de35b8488bbd9b42df4f4
Grafana Source Repository REPOSITORY
https://github.com/grafana/grafana
Grafana Release RELEASE
https://github.com/grafana/grafana/releases/tag/v11.6.15
Grafana Release RELEASE
https://github.com/grafana/grafana/releases/tag/v12.2.9
Grafana Release RELEASE
https://github.com/grafana/grafana/releases/tag/v12.3.7
Grafana Release RELEASE
https://github.com/grafana/grafana/releases/tag/v12.4.4
Grafana Release RELEASE
https://github.com/grafana/grafana/releases/tag/v13.0.2
Grafana Security Information SECURITY
https://grafana.com/security/security-advisories/cve-2026-42127

Frequently Asked Questions

What is CVE-2026-42127?
CVE-2026-42127 is a security vulnerability in Grafana involving Pre-authentication denial of service in the public dashboard query handler under CWE-400: Uncontrolled Resource Consumption.
Which Grafana versions are affected?
Affected versions include releases prior to 1.9.2-0.20260616075434-82ef13993059 across affected packages: github.com/grafana/grafana.
What version fixes CVE-2026-42127?
Upgrading to 1.9.2-0.20260616075434-82ef13993059 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/grafana/grafana affected?
Yes, github.com/grafana/grafana is affected in releases prior to Latest secure release, 1.9.2-0.20260616075434-82ef13993059. Upgrade your dependency to Latest secure release, 1.9.2-0.20260616075434-82ef13993059 or later.
What is the CVSS score of CVE-2026-42127?
CVE-2026-42127 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-42127?
CVE-2026-42127 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Go dependencies for CVE-2026-42127?
Run the dependency tree command: 'inspect dependencies for github.com/grafana/grafana'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3w66-95m3-8jxg",
  "modified" : "2026-09-21T23:00:48Z",
  "published" : "2026-06-22T18:34:17Z",
  "aliases" : [ "CVE-2026-42127" ],
  "summary" : "Grafana: Pre-authentication denial of service in the public dashboard query handler",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
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  } ],
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    "database_specific" : {
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    },
    "ranges" : [ {
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    "database_specific" : {
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    }
  }, {
    "package" : {
      "ecosystem" : "Go",
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
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    "database_specific" : {
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    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.9.2-0.20260616075434-82ef13993059"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42127"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/pull/125789"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/commit/82ef13993059351bf21de35b8488bbd9b42df4f4"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/grafana/grafana"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/releases/tag/v11.6.15"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/releases/tag/v12.2.9"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/releases/tag/v12.3.7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/releases/tag/v12.4.4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/grafana/grafana/releases/tag/v13.0.2"
  }, {
    "type" : "WEB",
    "url" : "https://grafana.com/security/security-advisories/cve-2026-42127"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-21T23:00:48Z",
    "nvd_published_at" : "2026-06-22T18:16:37Z"
  }
}