CVE-2026-92395

@fastify/proxy-addr is a Fastify plugin that determines a request's client address behind trusted reverse proxies, and it backs Fastify request.ip and request.ips. In versions 3.0.0 through 5.1.0, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as...

CVE-2026-92395

@fastify/proxy-addr (a Fastify plugin for determining client IP behind reverse proxies) is vulnerable to IP spoofing in versions 3.0.0 through 5.1.0. The root cause: an IPv4-mapped IPv6 trust subnet with an IPv4-sized prefix (e.g., ::ffff:10.0.0.0/8 instead of /104) is accepted silently but effec...