CVE-2026-92395

A flaw was found in @fastify/proxy-addr. This flaw allows a remote, unauthenticated attacker to bypass access controls and security policies by spoofing client IP Internet Protocol addresses. When configured with certain IPv4-mapped IPv6 network ranges, the plugin improperly treats all incoming...

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 vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet

@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 vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet

@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...

@anchan828/nest-redis-session-fastify (>=0.0.69, <=0.0.86), @bechara/nestjs-core (>=2.7.0, <=3.1.4) +58 more potentially affected by CVE-2026-92395 via @fastify/proxy-addr (3.0.0)

@fastify/proxy-addr NPM version 3.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on @fastify/proxy-addr and may be impacted: - @anchan828/nest-redis-session-fastify =0.0.69, =2.7.0, =0.23.0, =0.37.0-dev.2883368c84, =0.23.0, =0.34.0-dev.154,...

CVE-2026-92395 @fastify/proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet

@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...

EUVD-2026-80806

@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...

CVE-2026-92395: Authentication Bypass by Spoofing

@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...

PT-2026-93809

Name of the Vulnerable Software and Affected Versions @fastify/proxy-addr versions 3.0.0 through 5.1.0 Description This plugin, used to determine a request's client address behind trusted reverse proxies, incorrectly handles trust subnets written in IPv4-mapped IPv6 notation when an IPv4-sized...