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CVE-2026-118651— Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default

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 是一个基于 Go 的 Web 框架。在版本 4.0.0 至 5.4.0 期间，若未配置，其中间件可能会保留攻击者提供的请求头，并将其转发给上游服务。因此，远程客户端可诱导上游服务接收到伪造的客户端 IP 地址，从而破坏那些依赖 Echo 转发身份信息的基于 IP 的访问控制、速率限制、审计日志或地理限制等安全机制。该问题已在 Echo 5.4.0 版本中修复。

CVSS 5.3 · Medium Updated Oct 29, 2026

Possible ATT&CK Techniques 2 AI

T1070.006 · Timestomp T1036.004 · Masquerade Task or Service

Affected Version Matrix 1

Vendor	Product	Version Range	Status
labstack	echo	`>= 4.0.0, < 5.4.0`	affected

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Vulnerability Information

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Vulnerability Title

Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default

Source: CVE Program / CVE List V5

Vulnerability Description

Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echo's forwarded identity. This issue is fixed in Echo 5.4.0.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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	>= 4.0.0, < 5.4.0	-

II. Public POCs for CVE-2026-118651

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-118651

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Other References for CVE-2026-118651 (3)

https://github.com/labstack/echo/releases/tag/v5.4.0 x_refsource_MISC
https://github.com/labstack/echo/security/advisories/GHSA-99jh-6h7p-pp36 x_refsource_CONFIRM
https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-118651

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-2026-118657	5.9 MEDIUM	Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers
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