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…

GitHub Advisory Database에서 읽기

2026. 10. 29. 오전 04:53, GitHub Advisory Database에서 "Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default"을(를) 게시했습니다 (유형: 취약점 권고). 심각도는 "보통"(medium)입니다. 관련 기술: Go, GitHub. CVE: CVE-2026-118651.