## Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers

- 種別: advisory
- 重大度: medium
- 関連技術: go, github
- CVE: CVE-2026-118657
- 公開日時: 2026-10-28T21:04:52.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-2ffq-g2xg-c22p)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-2ffq-g2xg-c22p

影響: go:github.com/labstack/echo/v5 < 5.4.0 → 5.4.0, go:github.com/labstack/echo/v4 < 4.16.0 → 4.16.0
Context.Scheme() unconditionally trusts four client-controlled HTTP headers to determine the request scheme, with no mechanism to configure trusted sources. This allows a remote unauthenticated attacker to bypass HTTPS redirect enforcement and suppress HSTS headers. The trusted headers (checked in this order of precedence): 1. X-Forwarded-Proto 2. X-Forwarded-Protocol 3. X-Forwarded-Ssl 4. X-Url-Scheme Threat model Scenario A — Directly exposed application (vulnerable by default): The Echo appl…