CVE-2026-53718

{"id": "CVE-2026-53718", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53718", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-15T13:25:21.526527Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 4.7, "exploitabilityScore": 1.6}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "envoyproxy", "product": "gateway", "versions": [{"status": "affected", "version": "< 1.7.4"}, {"status": "affected", "version": ">= 1.8.0-rc.0, < 1.8.1"}]}]}], "published": "2026-09-14T21:17:13.140", "references": [{"url": "https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/pull/9171", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/pull/9172", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/pull/9173", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/releases/tag/v1.7.4", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/releases/tag/v1.8.1", "source": "security-advisories@github.com"}, {"url": "https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7", "source": "security-advisories@github.com"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-862"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-15T14:16:58.377", "sourceIdentifier": "security-advisories@github.com"}