CVE-2026-33807 | fastify express up to 4.0.4 onRegister interpretation conflict

April 15, 2026 Yanac

A vulnerability identified as critical has been detected in fastify express up to 4.0.4. This affects the function onRegister. The manipulation leads to interpretation conflict.

This vulnerability is referenced as CVE-2026-33807. Remote exploitation of the attack is possible. No exploit is available.

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