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EUVD-2026-264549

fkie_cve-2025-69211

Nest is a framework for building scalable Node.js server-side applications. Versions prior to 11.1.11 have a Fastify URL encoding middleware bypass. A NestJS application is vulnerable if it uses `@nestjs/platform-fastify`; relies on `NestMiddleware` (via `MiddlewareConsumer`) for security checks (authentication, authorization, etc.), or through `app.use()`; and applies middleware to specific routes using string paths or controllers (e.g., `.forRoutes('admin')`). Exploitation can result in unauthenticated users accessing protected routes, restricted administrative endpoints becoming accessible to lower-privileged users, and/or middleware performing sanitization or validation being skipped. This issue is patched in `@nestjs/platform-fastify@11.1.11`.

GHSA-8wpr-639p-ccrj — Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU)

Affected: npm: @nestjs/platform-fastify

A NestJS application is vulnerable if it meets all of the following criteria:

1. Platform: Uses `@nestjs/platform-fastify`. 2. Security Mechanism: Relies on `NestMiddleware` (via `MiddlewareConsumer`) for security checks (authentication, authorization, etc.), or through `app.use()` 3. Routing: Applies middleware to specific routes using string paths or controllers (e.g., `.forRoutes('admin')`). Example Vulnerable Config:

```ts // app.module.ts export class AppModule implements NestModule { configure(consumer: MiddlewareConsumer) { consumer .apply(AuthMiddleware) // Security check .forRoutes('admin'); // Vulnerable: Path-based restriction } } ```

Attack Vector:

- Target Route: `/admin` - Middleware Path: `admin` - Attack Request: `GET /%61dmin` - Result: Middleware is skipped (no match on `%61dmin`), but controller for `/admin` is executed.

Consequences:

- Authentication Bypass: Unauthenticated users can access protected routes. - Authorization Bypass: Restricted administrative endpoints become accessible to lower-privileged users. - Input Validation Bypass: Middleware performing sanitization or validation can be skipped.

### Patches

Patched in `@nestjs/platform-fastify@11.1.11`

### Resources

Credit goes to Hacktron AI for reporting this issue.