openhole-server forwarded the URL-decoded request path (r.URL.Path) to tunnel clients instead of the original request-target. Percent-encoded dot-segments (%2e) and separators (%2f) were decoded to ../ and / before reaching the local service.

Go's ServeMux rejects literal ../ paths, but percent-encoded traversal sequences bypassed this and were delivered to backends as working path traversal.

An unauthenticated remote attacker could read files outside the published web root on tunneled local services that resolve paths without canonicalization.

Example:

Encoded slashes (/a%2fb) could also bypass path-based access controls.

v0.1.2 forwards r.URL.EscapedPath() on the server and preserves the request-target on the CLI client.

Users should upgrade both openhole-server and the openhole CLI to v0.1.2 or later.