CVE-2026-118657 Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers

What is CVE-2026-118657?

CVE-2026-118657 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026.

Official description

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Context.Scheme unconditionally trusts forwarded scheme headers from any client. A client that reaches Echo directly over plaintext HTTP can claim an HTTPS scheme and bypass HTTPSRedirect because the request is treated as already secure. Separately, behind a TLS-terminating proxy that passes an attacker-controlled header, a claimed HTTP scheme can suppress the Strict-Transport-Security header even though the browser receives the response over HTTPS. The practical risk is reduced when a trusted proxy overwrites the headers and direct backend access is prevented, but the framework previously had no trusted-source configuration for this decision. This issue is fixed in 4.16.0 and 5.4.0.

Weakness: CWE-346

Which versions are affected by CVE-2026-118657?

4 open source packages ship an affected version, including github.com/labstack/echo/v4 and github.com/labstack/echo/v5.

How do I fix CVE-2026-118657?

Upgrade github.com/labstack/echo/v4 to 4.16.0 or later.

Is CVE-2026-118657 being exploited?

There is no known exploitation of CVE-2026-118657 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-118657, ECHO-931c-bced-8b2d, GHSA-2ffq-g2xg-c22p, UBUNTU-CVE-2026-118657.