medium5.3
CVE-2026-118653
Echo has Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration
Impact
Echo is a Go web framework. From 4.0.0 until 5.1.0, Context.RealIP falls back to client-supplied X-Forwarded-For or X-Real-IP values when Echo.IPExtractor is unset, and the default RateLimiter uses that result as its client identifier. A remote attacker can rotate arbitrary forwarded-address values to obtain new rate-limit buckets and bypass IP-based throttling used for controls such as brute-force or request-volume protection. This issue is fixed in Echo v5.1.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/labstack/echo/v5 | < 5.1.0 | 5.1.0 |
| go | github.com/labstack/echo/v4 | >= 4.0.0, <= 4.16.2 | none recorded |