EUVD-2026-20491
GHSA-92pp-h63x-v22m
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
4Description
## Summary A path handling inconsistency in `serveStatic` allows protected static files to be accessed by using repeated slashes (`//`) in the request path. When route-based middleware (e.g., `/admin/*`) is used for authorization, the router may not match paths containing repeated slashes, while `serveStatic` resolves them as normalized paths. This can lead to a middleware bypass. ## Details The routing layer and `serveStatic` handle repeated slashes differently. For example: - `/admin/secret.txt` => matches `/admin/*` - `//admin/secret.txt` => may not match `/admin/*` This inconsistency allows a request such as: ``` GET //admin/secret.txt ``` to bypass middleware registered on `/admin/*` and access protected files. ## Impact An attacker can access static files that are intended to be protected by route-based middleware by using repeated slashes in the request path. This can lead to unauthorized access to sensitive files under the static root. This issue affects applications that rely on `serveStatic` together with route-based middleware for access control.
Analysis
Path normalization inconsistency in Hono's node-server serveStatic middleware allows unauthenticated attackers to bypass route-based authorization middleware by using repeated slashes (e.g., //admin/secret.txt) to access protected static files, exposing sensitive information with low confidentiality impact (CVSS 5.3).
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