CVE-2026-118653 Echo: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-118653?
CVE-2026-118653 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026.
Official description
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.
Weakness: CWE-290
Which versions are affected by CVE-2026-118653?
4 open source packages ship an affected version, including github.com/labstack/echo/v4 and github.com/labstack/echo/v5.
| Package | Affected | Fixed in |
|---|---|---|
github.com/labstack/echo/v4 Go | From 4.0.0 to 4.16.2 | None |
github.com/labstack/echo/v4 Go | From 4.0.0 to 4.16.2 | None |
github.com/labstack/echo/v5 Go | All versions | 5.1.0 |
github.com/labstack/echo/v5 Go | All versions | 5.1.0 |
How do I fix CVE-2026-118653?
Upgrade to a fixed version.
Is CVE-2026-118653 being exploited?
There is no known exploitation of CVE-2026-118653 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-118653, GHSA-246p-cpwv-v3jq, UBUNTU-CVE-2026-118653.