Cloudanix VulnDB

CVE-2026-25766

Medium · 5.3

CVSS

5.3

EPSS

0.5%

Published

Feb 19, 2026

CISA due date

—

The record

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.

Affected packages

Ecosystem Package Introduced Fixed
Go github.com/labstack/echo/v5 5.0.0 5.0.3
openSUSE:Leap 15.6 govulncheck-vulndb 0 0.0.20260226T182644-150000.1.149.1

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