CVE-2026-53718Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass
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No exploitation reported and no EPSS estimate yet.
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Envoy Gateway is an open source project for managing Envoy Proxy as a standalone or Kubernetes-based application gateway. Prior to 1.7.4 and 1.8.1, an HTTPRoute can use an extension-managed custom backendRef to reference a backend resource in another namespace without a matching Gateway API ReferenceGrant in the target namespace. The custom-backend branch in internal/gatewayapi/route.go omits validateBackendNamespace, allowing the route-owning namespace to bind to and use the resource without the backend namespace owner's consent and violating the Gateway API cross-namespace authorization model. This issue is fixed in versions 1.7.4 and 1.8.1.
- CVSS
- 6.4 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L
- Weakness (CWE)
- CWE-862
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Sep 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
envoyproxy gateway envoyproxy:gateway (from the name) | before 1.7.4; from 1.8.0-rc.0, < 1.8.1 | CNA record |
References
- https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7x-refsource-confirm
- https://github.com/envoyproxy/gateway/pull/9171x-refsource-misc
- https://github.com/envoyproxy/gateway/pull/9172x-refsource-misc
- https://github.com/envoyproxy/gateway/pull/9173x-refsource-misc
- https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464x-refsource-misc
- https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7x-refsource-misc
- https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eeadx-refsource-misc
- https://github.com/envoyproxy/gateway/releases/tag/v1.7.4x-refsource-misc
- https://github.com/envoyproxy/gateway/releases/tag/v1.8.1x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.