CVE-2025-69211 Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU)
Attackers can bypass security middleware in NestJS Fastify applications to access protected routes or administrative endpoints without proper authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-69211?
CVE-2025-69211 is a medium-severity authentication bypass vulnerability in nestjs nest, published on 29 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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/[email protected]`.
Weakness: CWE-367
Which versions are affected by CVE-2025-69211?
2 open source packages ship an affected version, including @nestjs/platform-fastify. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@nestjs/platform-fastify npm | All versions | 11.1.11 |
@nestjs/platform-fastify npm | All versions | 11.1.11 |
Products include Nestjs Nest.
How do I fix CVE-2025-69211?
Upgrade @nestjs/platform-fastify to 11.1.11 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-69211 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-69211 exists.
Other vulnerabilities in nestjs nest
- CVE-2026-33011 Nest Fastify HEAD Request Middleware Bypass
- CVE-2026-2293 NestJS 11.1.13 - Lack of data validation allowing authentication/authorization bypass
- CVE-2026-40879 Nest: DoS via Recursive handleData in JsonSocket (TCP Transport)
- CVE-2026-35515 @nestjs/core Improperly Neutralizes Special Elements in Output Used by a Downstream Component ('Injection')
- CVE-2024-29409 nest allows a remote attacker to execute arbitrary code via the Content-Type header
Sources
Also known as GHSA-8wpr-639p-ccrj.