Patched code sample

import yaml
try:
    from yaml import CLoader as Loader, CDumper as Dumper
except ImportError:
    from yaml import Loader, Dumper


def safe_load_yaml(yaml_string):
    """
    Safely loads YAML data from a string, preventing arbitrary code execution.

    Uses yaml.safe_load instead of yaml.load to avoid vulnerabilities.
    """
    try:
        data = yaml.safe_load(yaml_string)  # Use safe_load
        return data
    except yaml.YAMLError as e:
        print(f"Error parsing YAML: {e}")
        return None

# Example usage to replace yaml.load in dynparam 'set' and 'get' verbs.
def process_yaml_input(yaml_input):
    """
    Processes YAML input using the safe loader.
    """
    data = safe_load_yaml(yaml_input)
    if data:
        print("Successfully parsed YAML data:", data)
        # Further processing of the parsed data goes here.
    else:
        print("Failed to parse YAML input.")

if __name__ == '__main__':
    # Example usage with a potentially malicious YAML payload
    malicious_yaml = """
    !!python/object/apply:os.system ["touch /tmp/pwned"]
    """

    # Process the YAML input using the safe loader.
    process_yaml_input(malicious_yaml)

    # Example with benign YAML data
    benign_yaml = """
    name: Alice
    age: 30
    city: New York
    """

    process_yaml_input(benign_yaml)