{"id":"EUVD-2026-78072","revision":null,"records":[{"revision":"52f4b2e2682042c9b18a1a889cea66f9","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-53718","aliases":[],"title":"Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass","description":"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.","state":0,"publishedAt":"2026-09-14T20:12:12.224+00:00","modifiedAt":"2026-09-15T13:55:25.432+00:00","affected":[{"ecosystem":"Vendor product","name":"gateway","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"envoyproxy\",\n                    \"product\": \"gateway\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.7.4\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 1.8.0-rc.0, < 1.8.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L","score":6.4,"severity":"MEDIUM"}],"references":["https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7","https://github.com/envoyproxy/gateway/pull/9171","https://github.com/envoyproxy/gateway/pull/9172","https://github.com/envoyproxy/gateway/pull/9173","https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464","https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7","https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead","https://github.com/envoyproxy/gateway/releases/tag/v1.7.4","https://github.com/envoyproxy/gateway/releases/tag/v1.8.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53718","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-53718","identifiers":["CVE-2026-53718"]},"retained":false,"historicalAffected":[]},{"revision":"3d74d732c99e4bd68c21c59e3874f012","observedAt":"2026-11-11T13:10:56.436+00:00","statement":{"source":"euvd","id":"EUVD-2026-78072","aliases":["CVE-2026-53718","GHSA-fcrp-7gc2-93g7"],"title":"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 …","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L","score":6.4,"severity":null}],"references":["https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7","https://github.com/envoyproxy/gateway/pull/9171","https://github.com/envoyproxy/gateway/pull/9172","https://github.com/envoyproxy/gateway/pull/9173","https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464","https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7","https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead","https://github.com/envoyproxy/gateway/releases/tag/v1.7.4","https://github.com/envoyproxy/gateway/releases/tag/v1.8.1"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78072","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 14, 2026, 8:12:12 PM","dateUpdated":"Sep 15, 2026, 1:55:25 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-78072","identifiers":["EUVD-2026-78072","CVE-2026-53718","GHSA-fcrp-7gc2-93g7"]},"retained":false,"historicalAffected":[]},{"revision":"ba8fd837aa55478abd7f925533d6cdd8","observedAt":"2026-10-25T13:17:16.273+00:00","statement":{"source":"nvd","id":"CVE-2026-53718","aliases":[],"title":"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 …","description":"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.","state":0,"publishedAt":"2026-09-14T21:17:13.14+00:00","modifiedAt":"2026-09-25T14:10:13.927+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L","score":6.4,"severity":"MEDIUM"}],"references":["https://github.com/envoyproxy/gateway/commit/5a78db82b7cf4fc5bebbeda2c50952892038a464","https://github.com/envoyproxy/gateway/commit/96e2b750868a459ace4b8b68e6a6e4fb0152b9b7","https://github.com/envoyproxy/gateway/commit/b4737180c7e597490c6363075c565fa8cf24eead","https://github.com/envoyproxy/gateway/pull/9171","https://github.com/envoyproxy/gateway/pull/9172","https://github.com/envoyproxy/gateway/pull/9173","https://github.com/envoyproxy/gateway/releases/tag/v1.7.4","https://github.com/envoyproxy/gateway/releases/tag/v1.8.1","https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53718","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Awaiting Analysis","weaknesses":["CWE-862"],"productCriteria":[],"sourceDates":{"published":"2026-09-14T21:17:13.140","lastModified":"2026-09-25T14:10:13.927"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-53718","identifiers":["CVE-2026-53718"]},"retained":false,"historicalAffected":[]},{"revision":"a4e5046c3eb447568f64845c9504d0c4","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-fcrp-7gc2-93g7","aliases":["BIT-envoy-gateway-2026-53718","CVE-2026-53718","GO-2026-6007"],"title":"Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass","description":"### 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’s 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)","state":0,"publishedAt":"2026-07-16T19:14:50+00:00","modifiedAt":"2026-09-21T09:40:46.6383591+00:00","affected":[{"ecosystem":"Go","name":"github.com/envoyproxy/gateway","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.8.0-rc.0"},{"kind":"fixed","version":"1.8.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/envoyproxy/gateway","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.7.4"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7","https://github.com/envoyproxy/gateway"],"sourceUrl":"https://github.com/advisories/GHSA-fcrp-7gc2-93g7","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-fcrp-7gc2-93g7","identifiers":["GHSA-fcrp-7gc2-93g7","BIT-envoy-gateway-2026-53718","CVE-2026-53718","GO-2026-6007"]},"retained":false,"historicalAffected":[]},{"revision":"e56e2677991c44fd8cb58ac70f23aa10","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-6007","aliases":["BIT-envoy-gateway-2026-53718","CVE-2026-53718","GHSA-fcrp-7gc2-93g7"],"title":"Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass in github.com/envoyproxy/gateway","description":"Envoy Gateway custom backendRef cross-namespace ReferenceGrant bypass in github.com/envoyproxy/gateway","state":0,"publishedAt":"2026-07-17T19:42:05+00:00","modifiedAt":"2026-09-21T09:40:46.6383591+00:00","affected":[{"ecosystem":"Go","name":"github.com/envoyproxy/gateway","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.7.4"},{"kind":"introduced","version":"1.8.0-rc.0"},{"kind":"fixed","version":"1.8.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/envoyproxy/gateway/security/advisories/GHSA-fcrp-7gc2-93g7"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-6007","license":"OSV · upstream source license applies","key":"osv:GO-2026-6007","identifiers":["GO-2026-6007","BIT-envoy-gateway-2026-53718","CVE-2026-53718","GHSA-fcrp-7gc2-93g7"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-12T11:55:28.1860721+00:00","complete":true,"records":1779,"lastAttemptAt":"2026-11-12T11:55:28.1860721+00:00","lastSuccessAt":"2026-11-12T11:55:28.4130785+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:55:28.4130791+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-64752486c567b55b31fb0d7225f5222bcd0019564ac0ac5f0649e242c7b19299-4a4604796d7c0adea2c1c677026f25a1e039e4a95710b02ad846575329daaa79","complete":true,"records":424651,"lastAttemptAt":"2026-11-12T11:53:33.8199862+00:00","lastSuccessAt":"2026-11-12T11:53:33.7811873+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:53:33.8199862+00:00","snapshotPublishedAt":"2026-11-12T11:27:22+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-0580dcc98aaa46a8935f8ff576f25037","complete":true,"records":13764,"lastAttemptAt":"2026-11-12T11:56:20.2141865+00:00","lastSuccessAt":"2026-11-12T11:56:20.209+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:56:20.209+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13817,"expectedIdentifiers":13817,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-12T11:55:28.1860721+00:00","complete":true,"records":1097,"lastAttemptAt":"2026-11-12T11:55:28.1860721+00:00","lastSuccessAt":"2026-11-12T11:55:28.4142299+00:00","error":null,"lastVerifiedAt":"2026-11-12T11:55:28.4142304+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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