Vulnerability in Labstack Echo
CVE-2026-118651
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Labstack Echo — versions >= 4.0.0, < 5.4.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-118651?
- CVE-2026-118651 is a medium-severity vulnerability in Labstack Echo, classified under Origin Validation Error. CVSS score: 5.3/10. Published 2026-10-28.
- How severe is CVE-2026-118651?
- Medium severity. CVSS v3 base score is 5.3 out of 10.