{"id":"GHSA-6mxq-jr92-3h2r","summary":"Duplicate Advisory: Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion","details":"## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-qq9q-x9w4-chhj. This link is maintained to preserve external references.\n\n## Original Description\nTraefik 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 The issue is fixed in version 3.7.7.","modified":"2026-08-05T22:01:01.304545847Z","published":"2026-07-22T12:32:18Z","withdrawn":"2026-08-05T21:49:07Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-08-05T21:49:07Z","nvd_published_at":"2026-07-22T12:18:20Z","cwe_ids":["CWE-863"],"severity":"MODERATE"},"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65601"},{"type":"WEB","url":"https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref"}],"affected":[{"package":{"name":"github.com/traefik/traefik","ecosystem":"Go","purl":"pkg:golang/github.com/traefik/traefik"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.7.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c 3.7.7","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-6mxq-jr92-3h2r/GHSA-6mxq-jr92-3h2r.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}