AIKIDO-2026-120510
@hono/node-server is vulnerable to Path Traversal
59
Medium Risk
This Affects:
@hono/node-serverTL;DR
The serveStatic middleware in @hono/node-server can serve protected static files on Windows when a request path contains a URL-encoded backslash. The Hono router treats a path like /admin%5Csecret.txt as a single segment, so prefix-mounted authorization middleware on /admin/* does not run. Before the fix, serveStatic allowed a decoded lone backslash through its path guard while Windows path resolution split it into a nested file under the static root. The fix extends path validation to reject backslash-based traversal patterns.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application runs on Windows with serveStatic together with prefix-mounted middleware for access control.
Background info
@hono/node-server is vulnerable to Path Traversal in versions 0.2.0 - 1.19.14 and 2.0.0 - 2.0.4.
How to fix this
Upgrade the @hono/node-server library to the patch version.
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