CVE-2026-118651
Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default
- State
- Published
- Severity
- 5.3 Medium
- Published
- Oct 28, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 28, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | GitHub_M |
Weaknesses
- CWE-346 Origin Validation Error
Affected Products
| Product | Versions |
|---|---|
echolabstack |
|
References
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