GHSA-FCRP-7GC2-93G7

Vulnerability from github – Published: 2026-07-16 19:14 – Updated: 2026-07-16 19:14
VLAI
Summary
Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass
Details

Impact

Envoy Gateway accepts extension-managed custom backendRefs from an HTTPRoute to a backend resource in another namespace without requiring a matching Gateway API ReferenceGrant in the target namespace. This breaks the Gateway API cross-namespace consent model: the namespace that owns the referenced backend resource does not need to opt in with a ReferenceGrant before another namespace’s HTTPRoute can use that resource.

Patches

1.7.4 1.8.1

Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/envoyproxy/gateway"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.8.0-rc.0"
            },
            {
              "fixed": "1.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/envoyproxy/gateway"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.7.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-53718"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-16T19:14:50Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nEnvoy Gateway accepts extension-managed custom backendRefs from an HTTPRoute to a backend resource in another namespace without requiring a matching Gateway API ReferenceGrant in the target namespace. This breaks the Gateway API cross-namespace consent model: the namespace that owns the referenced backend resource does not need to opt in with a ReferenceGrant before another namespace\u2019s HTTPRoute can use that resource.\n\n### Patches\n[1.7.4](https://github.com/envoyproxy/gateway/releases/tag/v1.7.4)\n[1.8.1](https://github.com/envoyproxy/gateway/releases/tag/v1.8.1)",
  "id": "GHSA-fcrp-7gc2-93g7",
  "modified": "2026-07-16T19:14:50Z",
  "published": "2026-07-16T19:14:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/envoyproxy/gateway"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass"
}



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