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EUVD-2026-342322

fkie_cve-2026-54653

datamodel-code-generator generates Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON, YAML, or CSV. From 0.17.0 until 0.60.2, datamodel-code-generator preserves attacker-controlled default_factory values in src/datamodel_code_generator/parser/jsonschema.py through JsonSchemaObject.init and get_field_extras and emits them into Field(default_factory=...) or field(default_factory=...), allowing Python expression execution when the generated model is imported. This issue is fixed in version 0.60.2.

GHSA-386q-5hp3-95m9 — `datamodel-code-generator` vulnerable to code injection in via attacker-controlled `default_factory` schema field

Affected: PyPI: datamodel-code-generator

### Summary

`datamodel-code-generator` is vulnerable to code injection when generating Python models from an attacker-controlled JSON Schema, OpenAPI, YAML, JSON, Avro, Protobuf, or XSD schema. When a property carries a `"default_factory"` key, its value is interpolated verbatim — as a raw Python expression — into the generated `Field(default_factory=...)` / `field(default_factory=...)` call. Because this assignment is evaluated at class-definition time (i.e. on `import` of the generated module), an attacker who controls the schema controls a Python expression that runs in the consumer's process. No special CLI flags are required.

### Details

The vulnerable chain spans the JSON-Schema-shaped parser and three sink locations (Pydantic v2, dataclass, msgspec):

**Source — schema → `extras`**:

- `src/datamodel_code_generator/parser/jsonschema.py:600-614` — `DEFAULT_FIELD_KEYS` includes the literal string `"default_factory"`. - `src/datamodel_code_generator/parser/jsonschema.py:457-459` — `JsonSchemaObject.__init__` stores any non-standard key (including `default_factory`) in `self.extras`. - `src/datamodel_code_generator/parser/jsonschema.py:797-812` — `get_field_extras` preserves `default_factory` through to the field model.

**Sinks — `extras` → generated Python expression**:

1. `src/datamodel_code_generator/model/pydantic_base.py:222-249`:

```python default_factory = data.pop("default_factory", None) ... if default_factory is not None: field_arguments…

PYSEC-2026-3555 — `datamodel-code-generator` vulnerable to code injection in via attacker-controlled `default_factory` schema field