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Cve-2026-33804

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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