{"id":"CVE-2026-65601","revision":"5f35bcaa4bfe4ac1a4a3c064b48698fb","records":[{"revision":"5f35bcaa4bfe4ac1a4a3c064b48698fb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-65601","aliases":[],"title":"Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef","description":"Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.","state":0,"publishedAt":"2026-07-22T11:21:47.468+00:00","modifiedAt":"2026-10-08T15:51:40.148+00:00","affected":[{"ecosystem":"Vendor product","name":"traefik","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"traefik\",\n                    \"product\": \"traefik\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:golang/github.com/traefik/traefik/v3\",\n                    \"versions\": [\n                        {\n                            \"version\": \"3.7.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"3.7.7\"\n                        },\n                        {\n                            \"version\": \"3.7.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj","https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0","https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-65601","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-65601","identifiers":["CVE-2026-65601"]},"retained":false,"historicalAffected":[]}],"coverage":[]}