CVE-2026-54281
Nest: Middleware Bypass on Fastify via Trailing Slash
Description
Nest is a framework for building scalable Node.js server-side applications. Prior to 11.1.24, an authentication bypass vulnerability exists in @nestjs/platform-fastify. 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. This vulnerability is fixed in 11.1.24.
INFO
Published Date :
June 22, 2026, 8:48 p.m.
Last Modified :
June 22, 2026, 8:48 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Solution
- Update @nestjs/platform-fastify to version 11.1.24.
- Verify middleware is applied correctly to all routes.
- Apply patches or updates from vendor.
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