CVE-2022-25936: Servst vulnerable to Path Traversal

The vulnerability stems from improper path validation in the static file handler. The proof-of-concept demonstrates that paths like '/../public-isprivate' were accessible despite being outside the intended root directory. The key vulnerable code is shown in the Gist analysis where indexOf(root) check passes for sibling directories sharing root's prefix. This check occurs in the main request handling function (statics middleware) in index.js, which was modified in the patched commit to use stricter validation.