Language: Python
Label: vulnerable
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 test_path_validation(mlflow_client):
    experiment_id = mlflow_client.create_experiment("tags validation")
    created_run = mlflow_client.create_run(experiment_id)
    run_id = created_run.info.run_id
    invalid_path = "../path"

    def assert_response(resp):
        assert resp.status_code == 400
        assert response.json() == {
            "error_code": "INVALID_PARAMETER_VALUE",
            "message": f"Invalid path: {invalid_path}",
        }

    response = requests.get(
        f"{mlflow_client.tracking_uri}/api/2.0/mlflow/artifacts/list",
        params={"run_id": run_id, "path": invalid_path},
    )
    assert_response(response)

    response = requests.get(
        f"{mlflow_client.tracking_uri}/get-artifact",
        params={"run_id": run_id, "path": invalid_path},
    )
    assert_response(response)

    response = requests.get(
        f"{mlflow_client.tracking_uri}//model-versions/get-artifact",
        params={"name": "model", "version": 1, "path": invalid_path},
    )
    assert_response(response)