Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU)

6.9 / 10

MEDIUM

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

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]`.

Basic Information

ID CVE-2025-69211

Source GitHub_M

Published Dec 29, 2025 at 16:01

Affected Product

Vendor nestjs

Product nest

Version < 11.1.11

Affected Versions nestjs nest < 11.1.11

CWE Classification

CWE-367

References

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    "published": "2025-12-29T16:01:22.801Z",
    "modified": "2025-12-29T16:01:22.801Z",
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Nest has a Fastify URL Encoding Middleware Bypass (TOCTOU)_CVE-2025-69211