medium5.3
CVE-2026-118651
Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default
Impact
Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echo's forwarded identity. This issue is fixed in Echo 5.4.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/labstack/echo/v5 | < 5.4.0 | 5.4.0 |
| go | github.com/labstack/echo/v4 | >= 4.0.0, <= 4.16.2 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Wikimedia Foundation | Echo | from 4.0.0, before 5.4.0 |