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CVE-2026-54281— Nest: Middleware Bypass on Fastify via Trailing Slash

Quick assessment

Affected
nestjs nest
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nestjs nest是nestjs团队开源的一个 Node.js 框架,用于使用 TypeScript/JavaScript 构建高效、可扩展和企业级的服务器端应用程序。 nestjs Nest存在授权问题漏洞，该漏洞源于在Fastify适配器上的中间件注册问题，可能导致未经身份验证的客户端通过向请求URL附加斜杠绕过中间件。

AI Predicted 7.5 Difficulty: Easy EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
nestjs nest < 11.1.24 affected
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I. Basic Information for CVE-2026-54281

Vulnerability Information
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Vulnerability Title
Nest: Middleware Bypass on Fastify via Trailing Slash
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
nestjs Nest 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nestjs nest是nestjs团队开源的一个 Node.js 框架,用于使用 TypeScript/JavaScript 构建高效、可扩展和企业级的服务器端应用程序。 nestjs Nest存在授权问题漏洞，该漏洞源于在Fastify适配器上的中间件注册问题，可能导致未经身份验证的客户端通过向请求URL附加斜杠绕过中间件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nestjs nest < 11.1.24 -

II. Public POCs for CVE-2026-54281

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III. Intelligence Information for CVE-2026-54281

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Vendor Advisories for CVE-2026-54281 (1)

IV. Related Vulnerabilities

Same product: nest
Same vendor: nestjs
Same weakness: CWE-863

V. Comments for CVE-2026-54281

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