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@fastify/middie

4 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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  • High 7.4
    CVE-2026-33804

    @fastify/middie vulnerable to middleware bypass via deprecated ignoreDuplicateSlashes option

    @fastify/middie versions 9.3.1 and earlier are vulnerable to middleware bypass when the deprecated Fastify ignoreDuplicateSlashes option is enabled. The middleware path matching logic does not account for duplicate slash normalization performed by Fastify's r…

    @fastify/middie @fastify/middie @fastify/middie npm
  • High 8.2
    CVE-2026-2880

    @fastify/middie has an improper path normalization vulnerability

    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 ignoreDuplicateSlas…

    @fastify/middie @fastify/middie @fastify/middie npm
  • High 8.4
    CVE-2026-22031

    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 (…

    fastify middie @fastify/middie npm