[ CVE-2026-118658 · Published 28 Oct 2026 ]
Echo has Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto
CVSS 4.7
EPSS <1%Fix available
[ Why it matters ]Priority signals
- Public proof-of-concept exploit exists (CISA SSVC)
[ Description ]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.
[ Fixes ]Fixes and patches
- github.com/labstack/echo/v5 5.1.1Fixed version · GitHub Advisories · go package github.com/labstack/echo/v5: upgrade to 5.1.1 or later (affected < 5.1.1)
- github.com/labstack/echo/v4 4.15.2Fixed version · GitHub Advisories · go package github.com/labstack/echo/v4: upgrade to 4.15.2 or later (affected < 4.15.2)
[ Packages ]Affected open-source packages
- github.com/labstack/echo/v5 goAffected < 5.1.1 · fixed in 5.1.1 · GHSA-23wf-92cp-8pcj
- github.com/labstack/echo/v4 goAffected < 4.15.2 · fixed in 4.15.2 · GHSA-23wf-92cp-8pcj