GHSA-6v32-fjc9-9qf6 Nest: Middleware Bypass on Fastify via Trailing Slash

• npm @nestjs/platform-fastify: < 11.1.24 → fixed in 11.1.24

Impact An authentication bypass vulnerability exists in `@nestjs/platform-fastify` (confirmed on version `11.1.24`, the latest available release at time of report). When middleware is registered through NestJS's `MiddlewareConsumer.forRoutes()` API on the Fastify adapter, an unauthenticated client can bypass the Nest middleware registered for that route by simply appending a trailing slash (`/`) to the request URL. This bypass works on the default Fastify adapter configuration — no special router options need to be enabled. Applications using the standard CRUD route shape (`GET /resource` and `GET /resource/:id`) are affected when they protect those routes with `MiddlewareConsumer.forRoutes()` middleware. Patches Fixed in `@nestjs/[email protected]` References Kudos goes to @a-tt-om