CVE-2026-2880— @fastify/middie has an improper path normalization vulnerability
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I. Basic Information for CVE-2026-2880
Vulnerability Information
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Vulnerability Title
@fastify/middie has an improper path normalization vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in @fastify/middie versions < 9.2.0 can result in authentication/authorization bypass when using path-scoped middleware (for example, app.use('/secret', auth)). When Fastify router normalization options are enabled (such as ignoreDuplicateSlashes, useSemicolonDelimiter, and related trailing-slash behavior), crafted request paths may bypass middleware checks while still being routed to protected handlers.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
@fastify/middie 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
@fastify/middie是Fastify开源的一个中间件引擎。 @fastify/middie 9.2.0之前版本存在安全漏洞，该漏洞源于路径范围中间件在使用路由器规范化选项时可能被绕过，可能导致身份验证或授权绕过。
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 |
|---|---|---|---|---|
| @fastify/middie | @fastify/middie | 0.0.0 ~ 9.2.0 | - |
II. Public POCs for CVE-2026-2880
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IV. Related Vulnerabilities
V. Comments for CVE-2026-2880
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