GitHub Advisoryadvisory · Go

GHSA-fcrp-7gc2-93g7 Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass

MEDIUM Published 2026-07-16 Modified 2026-07-16 Official page ↗
Aliases
CVE-2026-53718
Ecosystem
Go
Packages
github.com/envoyproxy/gateway
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
Weaknesses
CWE-862
Reviewed
2026-07-16

Affected packages

• Go github.com/envoyproxy/gateway: >= 1.8.0-rc.0, < 1.8.1 → fixed in 1.8.1 • Go github.com/envoyproxy/gateway: < 1.7.4 → fixed in 1.7.4

Description

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

Related

Alias · CVE (1)

  • CVE-2026-53718 Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. vulnerability

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References