CVE-2026-18174

@fastify/forwarded resolves client addresses from the X-Forwarded-For header. In versions before 3.0.2, when the header contains two or more comma separated entries, the parser trims only space characters and does not strip horizontal tabs, even though RFC 7230 defines optional whitespace as both...

CVE-2026-18174 @fastify/forwarded vulnerable to improper input validation via unstripped tab characters in X-Forwarded-For

@fastify/forwarded resolves client addresses from the X-Forwarded-For header. In versions before 3.0.2, when the header contains two or more comma separated entries, the parser trims only space characters and does not strip horizontal tabs, even though RFC 7230 defines optional whitespace as both...

CVE-2026-18174

The CVE-2026-18174 entry concerns @fastify/forwarded. In versions before 3.0.2, the X-Forwarded-For parser trims only spaces when entries are comma-separated and does not strip horizontal tabs. As a result, an entry padded with a tab retains a literal tab in the resolved client IP string, potenti...