What’s Vulnerable › Vulnerabilities

CVE-2026-118651: Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-28 · updated 2026-10-29
• Weakness: CWE-346

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.

Affected products

• labstack echo: from 4.0.0, < 5.4.0

References

• https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af
• https://github.com/labstack/echo/releases/tag/v5.4.0
• https://github.com/labstack/echo/security/advisories/GHSA-99jh-6h7p-pp36

Get alerted when CVE-2026-118651 or the next vulnerability affects your stack