Language: Python
Label: vulnerable
CWE: CWE-22 \u2014 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Code:
def validate_path_is_safe(path):
    """
    Validates that the specified path is safe to join with a trusted prefix. This is a security
    measure to prevent path traversal attacks.
    A valid path should:
        not contain separators other than '/'
        not contain .. to navigate to parent dir in path
        not be an absolute path
    """
    from mlflow.utils.file_utils import local_file_uri_to_path

    exc = MlflowException(f"Invalid path: {path}", error_code=INVALID_PARAMETER_VALUE)
    if any((s in path) for s in ("#", "%23")):
        raise exc

    if is_file_uri(path):
        path = local_file_uri_to_path(path)
    if (
        any((s in path) for s in _OS_ALT_SEPS)
        or ".." in path.split("/")
        or pathlib.PureWindowsPath(path).is_absolute()
        or pathlib.PurePosixPath(path).is_absolute()
        or (is_windows() and len(path) >= 2 and path[1] == ":")
    ):
        raise exc