GHSA-wc8c-qw6v-h7f6 — @hono/node-server has authorization bypass for protected static paths via encoded slashes in Serve Static Middleware

Affected: npm: @hono/node-server

## Summary

When using @hono/node-server's static file serving together with route-based middleware protections (e.g. protecting `/admin/*`), inconsistent URL decoding can allow protected static resources to be accessed without authorization.

In particular, paths containing encoded slashes (`%2F`) may be evaluated differently by routing/middleware matching versus static file path resolution, enabling a bypass where middleware does not run but the static file is still served.

## Details

The routing layer and the node-server static handler normalize request paths differently. The router preserves `%2F` as a literal string when matching routes, while the static handler decodes `%2F` into `/` before resolving the filesystem path.

Example request:

- `/admin%2Fsecret.html`

This may: - fail to match middleware intended for `/admin/*`, but - still be resolved by the static handler as `/admin/secret.html` under the configured static root.

This does not allow access outside the configured static root and is not a path traversal vulnerability.

## Impact

An unauthenticated attacker could bypass route-based authorization protections for protected static resources by supplying paths containing encoded slashes.

Applications relying solely on route-based middleware to protect static subpaths under the same static root may have exposed those resources.

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GHSA-wc8c-qw6v-h7f6 — @hono/node-server has authorization bypass for protected static paths via encoded slashes in Serve Static Middleware