Patched code sample

import re
from typing import List, Dict, Any

class PydanticV2BaseModel:
    fields: List[Any]
    validators: List[str]

    def _process_validators(self, extra_validators: Dict[str, str]) -> None:
        """
        Processes extra validators from --extra-template-data.
        This method is a simplified representation based on the CVE description.
        """
        for field in self.fields:
            # In a real implementation, field is an object with a .name attribute
            if validator_logic := extra_validators.get(field.name):
                # FIX: Validate the user-provided string to ensure it does not contain characters that could be used to inject additional statements.
                if re.search(r"[;\n]", validator_logic):
                    raise ValueError(f"Potentially unsafe validator for field '{field.name}'")
                validator_string = (
                    f'@field_validator("{field.name}")\n'
                    f'@classmethod\n'
                    f'def validate_{field.name}(cls, v):\n'
                    f'    {validator_logic}\n'
                    f'    return v'
                )
                self.validators.append(validator_string)