Vulnerability in Labstack Echo
CVE-2026-118653
Echo is a Go web framework. From 4.0.0 until 5.1.0, Context.RealIP falls back to client-supplied X-Forwarded-For or X-Real-IP values when Echo.IPExtractor is unset, and the default RateLimiter uses that result as its client identifier. A remote attacker can rotate arbitrary forwarded-address values to obtain new rate-limit buckets and bypass IP-based throttling used for controls such as brute-force or request-volume protection. This issue is fixed in Echo v5.1.0.
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, < 5.1.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-118653?
- CVE-2026-118653 is a medium-severity vulnerability in Labstack Echo, classified under Authentication Bypass by Spoofing. CVSS score: 5.3/10. Published 2026-10-28.
- How severe is CVE-2026-118653?
- Medium severity. CVSS v3 base score is 5.3 out of 10.