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CVE-2026-25766— Echo has a Windows path traversal via backslash in middleware.Static default filesystem

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Veal98个人开发者的一套前后端不分离的开源社区系统。 Echo 5.0.0版本至5.0.2版本存在路径遍历漏洞，该漏洞源于Windows系统上middleware.Static处理反斜杠不当，可能导致路径遍历和远程文件读取。

CVSS 5.3 · Medium EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-25766

Vulnerability Information
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Vulnerability Title
Echo has a Windows path traversal via backslash in middleware.Static default filesystem
Source: CVE Program / CVE List V5
Vulnerability Description
Echo is a Go web framework. In versions 5.0.0 through 5.0.2 on Windows, Echo’s `middleware.Static` using the default filesystem allows path traversal via backslashes, enabling unauthenticated remote file read outside the static root. In `middleware/static.go`, the requested path is unescaped and normalized with `path.Clean` (URL semantics). `path.Clean` does not treat `\` as a path separator, so `..\` sequences remain in the cleaned path. The resulting path is then passed to `currentFS.Open(...)`. When the filesystem is left at the default (nil), Echo uses `defaultFS` which calls `os.Open` (`echo.go:792`). On Windows, `os.Open` treats `\` as a path separator and resolves `..\`, allowing traversal outside the static root. Version 5.0.3 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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
Vulnerability Title
Echo 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Echo是Veal98个人开发者的一套前后端不分离的开源社区系统。 Echo 5.0.0版本至5.0.2版本存在路径遍历漏洞，该漏洞源于Windows系统上middleware.Static处理反斜杠不当，可能导致路径遍历和远程文件读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
labstack echo >= 5.0.0, < 5.0.3 -

II. Public POCs for CVE-2026-25766

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III. Intelligence Information for CVE-2026-25766

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Vendor Advisories for CVE-2026-25766 (1)

IV. Related Vulnerabilities

Same product: echo
Same vendor: labstack
Same weakness: CWE-22

V. Comments for CVE-2026-25766

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