datamodel-code-generator generates Python data models from schema definitions. From 0.14.1 until 0.60.2, the --extra-template-data comment field is rendered into Python comments in src/datamodel_code_generator/model/template/TypeAliasAnnotation.jinja2, src/datamodel_code_generator/model/template/TypedDict.jinja2, src/datamodel_code_generator/model/template/dataclass.jinja2, src/datamodel_code_generator/model/template/msgspec.Struct.jinja2, src/datamodel_code_generator/model/template/pydantic/BaseModel.jinja2, and src/datamodel_code_generator/model/template/pydantic_v2/BaseModel.jinja2 without neutralizing carriage returns in Python # comments, allowing an attacker-controlled comment value to inject Python code into generated models that runs when imported. This issue is fixed in version 0.60.2.
Affected: PyPI: datamodel-code-generator
### Summary
`datamodel-code-generator` is vulnerable to code injection when a developer passes an `--extra-template-data` file whose `comment` value contains a literal `\r` (carriage return). The `comment` variable is rendered into a Python `#` comment in six built-in templates with **no** line-terminator escaping. Python's tokenizer treats a bare CR as a physical-line terminator (see [Python language reference — Physical lines](https://docs.python.org/3/reference/lexical_analysis.html#physical-lines)), so the comment ends at the `\r` and the text after it is parsed as Python, including, when the CR is followed by suitable indentation, as a statement within the class body that follows on the next template line.
### Details
The vulnerable templates each contain `# {{ comment }}` with no escaping:
- `src/datamodel_code_generator/model/template/TypeAliasAnnotation.jinja2:12` and `:19` - `src/datamodel_code_generator/model/template/TypeAliasType.jinja2:12` and `:19` - `src/datamodel_code_generator/model/template/TypeStatement.jinja2:12` and `:19` - `src/datamodel_code_generator/model/template/pydantic_v2/BaseModel.jinja2:4` - `src/datamodel_code_generator/model/template/pydantic_v2/RootModel.jinja2:19` - `src/datamodel_code_generator/model/template/pydantic_v2/RootModelTypeAlias.jinja2:13`
The `pydantic_v2/BaseModel.jinja2:4` site is representative:
```jinja2 class {{ class_name }}({{ base_class }}):{% if comment is defined %} # {{ comment }}{% endif %} ```
When the deve…
Affected: PyPI: datamodel-code-generator
### Summary
`datamodel-code-generator` is vulnerable to code injection when a developer passes an `--extra-template-data` file whose `comment` value contains a literal `\r` (carriage return). The `comment` variable is rendered into a Python `#` comment in six built-in templates with **no** line-terminator escaping. Python's tokenizer treats a bare CR as a physical-line terminator (see [Python language reference — Physical lines](https://docs.python.org/3/reference/lexical_analysis.html#physical-lines)), so the comment ends at the `\r` and the text after it is parsed as Python, including, when the CR is followed by suitable indentation, as a statement within the class body that follows on the next template line.
### Details
The vulnerable templates each contain `# {{ comment }}` with no escaping:
- `src/datamodel_code_generator/model/template/TypeAliasAnnotation.jinja2:12` and `:19` - `src/datamodel_code_generator/model/template/TypeAliasType.jinja2:12` and `:19` - `src/datamodel_code_generator/model/template/TypeStatement.jinja2:12` and `:19` - `src/datamodel_code_generator/model/template/pydantic_v2/BaseModel.jinja2:4` - `src/datamodel_code_generator/model/template/pydantic_v2/RootModel.jinja2:19` - `src/datamodel_code_generator/model/template/pydantic_v2/RootModelTypeAlias.jinja2:13`
The `pydantic_v2/BaseModel.jinja2:4` site is representative:
```jinja2 class {{ class_name }}({{ base_class }}):{% if comment is defined %} # {{ comment }}{% endif %} ```
When the deve…