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

Quick assessment

Affected

labstack echo

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Echo 是一个用 Go 语言编写的 Web 框架。在 4.16.0 和 5.4.0 版本之前，会无条件信任来自任何客户端的转发协议头（forwarded scheme headers）。这意味着，如果攻击者通过明文 HTTP 直接访问 Echo，他们可以伪造 HTTPS 协议头，从而绕过机制，因为框架会将该请求视为已加密的安全请求。此外，在 TLS 终止代理（TLS-terminating proxy）后方，如果代理传递了由攻击者控制的协议头，攻击者可以伪造 HTTP 协议头，导致即使浏览器是通过 HTTPS

CVSS 5.9 · Medium Updated Oct 29, 2026

Possible ATT&CK Techniques 2 AI

T1572 · Protocol Tunneling T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

源验证错误

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
labstack	echo	>= 5.0.0, < 5.4.0	-

II. Public POCs for CVE-2026-118657

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-118657

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Other References for CVE-2026-118657 (5)

https://github.com/labstack/echo/releases/tag/v5.4.0 x_refsource_MISC
https://github.com/labstack/echo/releases/tag/v4.16.0 x_refsource_MISC
https://github.com/labstack/echo/security/advisories/GHSA-2ffq-g2xg-c22p x_refsource_CONFIRM
https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1 x_refsource_MISC
https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-118657

Same Patch Batch · labstack · 2026-10-28 · 16 CVEs total

CVE-2026-118264	9.1 CRITICAL	Echo: Rejected WebSocket upgrades can bypass Echo route-level access controls
CVE-2026-118260	8.2 HIGH	Echo: BodyDump captures request and response bodies without size limits in v4
CVE-2026-118262	8.2 HIGH	Echo: WebSocket proxy can retain connections and handlers after client disconnect
CVE-2026-118261	8.2 HIGH	Echo: Decompress permits unbounded gzip expansion in v4
CVE-2026-118650	7.5 HIGH	Echo: middleware.Static: `%2F`-encoded path bypasses route/group middleware guarding a sta
CVE-2026-118263	6.3 MEDIUM	Echo: BodyDump can discard BodyLimit overflow errors for unknown-length requests
CVE-2026-118652	6.1 MEDIUM	Echo: Reflected Cross-Site Scripting (XSS) via unsanitized JSONP callback in Context.JSONP
CVE-2026-118656	6.1 MEDIUM	Echo: Open Redirect via Control-Character Prefix Defeating sanitizeURI
CVE-2026-118654	5.9 MEDIUM	Echo static file middleware route protection bypass via encoded dot-dot traversal
CVE-2026-118655	5.9 MEDIUM	Echo: Static Middleware Double-Unescape Path Traversal
CVE-2026-118651	5.3 MEDIUM	Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default
CVE-2026-118266	5.3 MEDIUM	Echo: CSRF Protection Bypass via MethodOverride Rewriting POST to Safe Method
CVE-2026-118265	5.3 MEDIUM	Echo: X-Real-IP extractor trusts the header value instead of the sending peer
CVE-2026-118653	5.3 MEDIUM	Echo: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration
CVE-2026-118658	4.7 MEDIUM	Echo: Arbitrary Scheme Injection in WWWRedirect/NonWWWRedirect Middlewares via X-Forwarded

IV. Related Vulnerabilities

Same product: echo

Same vendor: labstack

Same weakness: CWE-346