GHSA-6mxq-jr92-3h2r: Duplicate Advisory Traefik Gateway API HTTPRoute BackendRef Vulnerability

MODERATE
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CWE-863
Published
Advisory Summary

GHSA-6mxq-jr92-3h2r is a MODERATE traefik gateway api httproute backendref vulnerability (CWE-863: Incorrect Authorization) affecting Duplicate Advisory libraries in the Go ecosystem. The issue involves traefik gateway api httproute backendref extensionref namespace confusion. Remediation is available in the latest vendor maintenance releases.

GHSA-6mxq-jr92-3h2r at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-6mxq-jr92-3h2r
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-863: Incorrect Authorization
Affected Product Duplicate Advisory
Package Ecosystem Go
Published Date
Last Updated

How to Fix GHSA-6mxq-jr92-3h2r

To remediate this vulnerability, upgrade all affected Duplicate Advisory 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/traefik/traefik fixed: Latest secure release 
Upgrade github.com/traefik/traefik to Latest secure release
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/traefik/traefik

How to Check if You Are Affected

To determine whether your application is affected by GHSA-6mxq-jr92-3h2r, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for github.com/traefik/traefik

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Duplicate Advisory, 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

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-qq9q-x9w4-chhj. This link is maintained to preserve external references. ## Original Description Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

GHSA-6mxq-jr92-3h2r Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
github.com/traefik/traefik
golang/github.com/traefik/traefik
Go
≥ 3.7.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj
NVD — GHSA-6mxq-jr92-3h2r NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65601
Security Fix Commit FIX COMMIT
https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0
www.vulncheck.com/advisories/traefik-... WEB
https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref

Frequently Asked Questions

What is GHSA-6mxq-jr92-3h2r?
GHSA-6mxq-jr92-3h2r is a security vulnerability in Duplicate Advisory involving Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion under CWE-863: Incorrect Authorization.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: github.com/traefik/traefik.
What version fixes GHSA-6mxq-jr92-3h2r?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/traefik/traefik affected?
Yes, github.com/traefik/traefik is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with GHSA-6mxq-jr92-3h2r?
GHSA-6mxq-jr92-3h2r is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check Go dependencies for GHSA-6mxq-jr92-3h2r?
Run the dependency tree command: 'inspect dependencies for github.com/traefik/traefik'. 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-6mxq-jr92-3h2r",
  "modified" : "2026-08-05T21:49:07Z",
  "published" : "2026-07-22T12:32:18Z",
  "withdrawn" : "2026-08-05T21:49:07Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-qq9q-x9w4-chhj. This link is maintained to preserve external references.\n\n## Original Description\nTraefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/traefik/traefik"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.7.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 3.7.7"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-65601"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-05T21:49:07Z",
    "nvd_published_at" : "2026-07-22T12:18:20Z"
  }
}