CVE-2026-118658

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CVE-2026-118658

Summary: Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded-Proto

Details: 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.

References: https://github.com/labstack/echo/releases/tag/v4.15.2, https://github.com/labstack/echo/releases/tag/v5.1.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118658.json, https://github.com/labstack/echo/security/advisories/GHSA-23wf-92cp-8pcj, https://nvd.nist.gov/vuln/detail/CVE-2026-118658, https://github.com/labstack/echo/commit/ca4f38a474302aabee93c66bdd0052359882e181, https://github.com/labstack/echo/commit/d1d8ad3f99dd9b80542cd0c357d56a8916c515df