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CVE-2026-118653— Echo: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration

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 语言的 Web 框架。在从 4.0.0 到 5.1.0 的版本中，当未设置 时， 会回退到由客户端提供的 或 头值；而默认的 （速率限制器）会将该结果用作客户端标识符。远程攻击者可以通过轮换任意的转发地址值来获取新的速率限制配额，从而绕过基于 IP 的限流机制（例如用于防御暴力破解或请求量激增等安全控制）。该问题已在 Echo v5.1.0 版本中修复。

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-118653

Vulnerability Information
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Vulnerability Title
Echo: Rate Limiter Bypass via Spoofed X-Forwarded-For Header in Default Configuration
Source: CVE Program / CVE List V5
Vulnerability Description
Echo is a Go web framework. From 4.0.0 until 5.1.0, Context.RealIP falls back to client-supplied X-Forwarded-For or X-Real-IP values when Echo.IPExtractor is unset, and the default RateLimiter uses that result as its client identifier. A remote attacker can rotate arbitrary forwarded-address values to obtain new rate-limit buckets and bypass IP-based throttling used for controls such as brute-force or request-volume protection. This issue is fixed in Echo v5.1.0.
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
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
labstack echo >= 4.0.0, < 5.1.0 -

II. Public POCs for CVE-2026-118653

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III. Intelligence Information for CVE-2026-118653

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Other References for CVE-2026-118653 (3)

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-2026-118651 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-2026-118658 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-290