CVE-2026-118654— Echo static file middleware route protection bypass via encoded dot-dot traversal

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，Echo 的静态文件处理器会在路由匹配后对路径中的点段（dot segments，如或）进行规范化处理，从而导致即使某个直接路径已通过路由级中间件加以保护，攻击者仍可能通过公开静态路由访问到该文件。当这些文件在路径规范化后也能通过静态文件系统挂载点被访问时，未认证的攻击者即可读取应用程序原本意图通过路由级中间件进行保护的文件。此漏洞是 CVE-2026-55677 修复不完整的遗留问题。该问题已在 4.16.0 和

CVSS 5.9 · Medium Updated Oct 29, 2026

Possible ATT&CK Techniques 3 AI

T1038 T1083 · File and Directory Discovery T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Echo static file middleware route protection bypass via encoded dot-dot traversal

Source: CVE Program / CVE List V5

Vulnerability Description

Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Echo's static file handlers can normalize dot segments after route matching and serve a file through a public static route even though the corresponding direct path is protected by route-level middleware. An unauthenticated attacker can read files that an application intended to protect with route-level middleware, when those files are also reachable through a static filesystem mount after path normalization. This vulnerability is the result of an incomplete fix for CVE-2026-55677. 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:N/S:U/C:H/I:N/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

对路径名的限制不恰当(路径遍历)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
labstack	echo	< 4.16.0	-

II. Public POCs for CVE-2026-118654

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-118654

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Other References for CVE-2026-118654 (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-3pmx-cf9f-34xr 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-2026-118654

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-2026-118655	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-2026-118653	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-22