The vulnerability description indicates that improper path resolution leads to directory traversal. However, without access to the enserver source code, commit diffs, or explicit function names from the provided information, it is impossible to identify the exact vulnerable functions with high confidence. The root cause likely resides in the file-serving logic that processes user-supplied URL paths (e.g., via fs.readFile or similar filesystem operations) without proper normalization or validation. Since no code snippets, patch details, or function names are disclosed in the provided data, specific functions cannot be conclusively determined.