Echo has a Static Middleware Double-Unescape Path Traversal

影響: go:github.com/labstack/echo/v5 < 5.2.0 → 5.2.0, go:github.com/labstack/echo/v4 < 4.15.3 → 4.15.3

Commit a9ede66a (PR #3006, issue #2599) silently fixed a path traversal vulnerability in the Echo web framework's static file middleware. Vulnerability The static middleware double-unescaped URL paths. Go's net/http already decodes Request.URL.Path, but middleware/static.go unconditionally called url.PathUnescape() again: go // BEFORE (vulnerable) pathUnescape := true This reassembled path traversal sequences from double-encoded input. An attacker could send GET /%2e%2e%2fsecret.txt or /..%252f…

在 GitHub Advisory Database 阅读

2026/10/29 06:04，GitHub Advisory Database 发布了“Echo has a Static Middleware Double-Unescape Path Traversal”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：Go、GitHub。CVE：CVE-2026-118655。