CVE-2026-118658 Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-118658?
CVE-2026-118658 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026.
Official description
Echo is a Go web framework. Prior to 4.15.2 and 5.1.1, Context.Scheme returns values from X-Forwarded-Proto, X-Forwarded-Protocol, or X-Url-Scheme without validating that they are supported web schemes. WWWRedirect and NonWWWRedirect use that value to construct a Location header, so an attacker controlling a forwarded scheme header can cause a redirect to use an arbitrary URI scheme. Exploitation requires an affected redirect middleware and user interaction with the response; the HTTPS-specific redirect variants hardcode HTTPS and are unaffected. This issue is fixed in 4.15.2 and 5.1.1.
Weakness: CWE-601
Which versions are affected by CVE-2026-118658?
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 | All versions | 4.15.2 |
github.com/labstack/echo/v4 Go | All versions | 4.15.2 |
github.com/labstack/echo/v5 Go | All versions | 5.1.1 |
github.com/labstack/echo/v5 Go | All versions | 5.1.1 |
How do I fix CVE-2026-118658?
Upgrade github.com/labstack/echo/v4 to 4.15.2 or later.
Is CVE-2026-118658 being exploited?
There is no known exploitation of CVE-2026-118658 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-118658, GHSA-23wf-92cp-8pcj, UBUNTU-CVE-2026-118658.