CVE-2026-53718

mediumCVSS 6.4covered by 1 sourcefirst seen 2026-07-16

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

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Advisory coverage (1)

mediumGHSA-fcrp-7gc2-93g7: Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypassghsa · 2026-07-16

External references

NVD record for CVE-2026-53718

CVE.org record

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