CVE-2026-118651
Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-346 |
| Vendor | labstack |
| Product | echo |
| Published | Oct 28, 2026 |
| Last Updated | Oct 28, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
labstack / echo
>= 4.0.0, < 5.4.0