Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default

影響: go:github.com/labstack/echo/v5 < 5.4.0 → 5.4.0, go:github.com/labstack/echo/v4 >= 4.0.0, <= 4.16.2

The Echo proxy middleware (middleware/proxy.go) preserves an incoming X-Real-IP header verbatim and forwards it to the upstream service when Echo#IPExtractor is not configured — which is the default. Because any HTTP client can supply an arbitrary X-Real-IP value, an attacker can cause Echo to relay a spoofed client IP address to every upstream service behind the proxy, undermining upstream IP-based access controls, rate limiting, audit logging, and geo-restriction. Affected Component - middlew…

在 GitHub Advisory Database 阅读

2026/10/29 04:53，GitHub Advisory Database 发布了“Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：Go、GitHub。CVE：CVE-2026-118651。