Language: Python
Label: safe
CWE: CWE-29 \u2014 Path Traversal: '\..\filename'
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory.

Code:
def is_file_uri(uri):
    return urllib.parse.urlparse(uri).scheme == "file"