## Summary The `unstable_redirect()` helper exported from `waku/router/server` (`packages/waku/src/router/define-router.tsx:156–161`) accepts an arbitrary string and reflects it unchanged into the HTTP `Location` response header with no URL validation, scheme restriction, or path-only enforcement. Any application that passes user-controlled input to this helper — the natural pattern documented in the JSDoc and official fixtures — is vulnerable to open redirect attacks. An attacker who convinces