Fastify Middie Middleware Path Bypass

@fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of `/admin`). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. Version 9.1.0 fixes the issue.

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

URL编码处理不恰当(Hex编码)

@fastify/middie 安全漏洞

@fastify/middie是Fastify开源的一个中间件引擎。 @fastify/middie 9.1.0之前版本存在安全漏洞，该漏洞源于路径前缀匹配不当，可能导致中间件绕过。

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