Language: Python
Label: vulnerable
CWE: CWE-434 \u2014 Unrestricted Upload of File with Dangerous Type
The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment.

Code:
def _upload_artifact(artifact_path):
    """
    A request handler for `PUT /mlflow-artifacts/artifacts/<artifact_path>` to upload an artifact
    to `artifact_path` (a relative path from the root artifact directory).
    """
    validate_path_is_safe(artifact_path)
    head, tail = posixpath.split(artifact_path)
    with tempfile.TemporaryDirectory() as tmp_dir:
        tmp_path = os.path.join(tmp_dir, tail)
        with open(tmp_path, "wb") as f:
            chunk_size = 1024 * 1024  # 1 MB
            while True:
                chunk = request.stream.read(chunk_size)
                if len(chunk) == 0:
                    break
                f.write(chunk)

        artifact_repo = _get_artifact_repo_mlflow_artifacts()
        artifact_repo.log_artifact(tmp_path, artifact_path=head or None)

    return _wrap_response(UploadArtifact.Response())