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high advisory

@fastify/middie Middleware Bypass Vulnerability (CVE-2026-33804)

A middleware bypass vulnerability (CVE-2026-33804) exists in @fastify/middie versions 9.3.1 and earlier when the deprecated Fastify ignoreDuplicateSlashes option is enabled, potentially allowing unauthorized access.

fastify middie middleware bypass cve-2026-33804 defense-evasion
2r 1t 1c
high advisory

@fastify/middie Middleware Bypass Vulnerability via Duplicate Slashes

`@fastify/middie` versions 9.3.1 and earlier are vulnerable to middleware bypass via URLs with duplicate leading slashes due to improper handling of the deprecated `ignoreDuplicateSlashes` option, potentially allowing unauthorized access to protected resources.

Fastify +1 middie middleware-bypass vulnerability defense-evasion
2r 1t 1c