CVE-2026-118651
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductGithub.com/labstack/echo/v5
PublishedOct 28, 2026
First seenNov 4, 2026
Weakness typeCWE-346CWE-346
How to fix
Update
- github.com/labstack/echo/v55.4.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/labstack/echo/v5Go | v < 5.4.0 | 5.4.0 |
| github.com/labstack/echo/v4Go | 4.0.0 ≤ v ≤ 4.16.2 | — |
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