CVE-2026-54656 `datamodel-code-generator` vulnerable to code execution on import via unescaped `validators` entries in --extra-template-data
Attackers can execute arbitrary Python code by injecting malicious validators into generated Pydantic models via the extra-template-data option.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-54656?
CVE-2026-54656 is a high-severity code injection vulnerability in koxudaxi datamodel-code-generator, published on 28 Jul 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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 0.52.1 until 0.60.2, datamodel-code-generator interpolates validators from --extra-template-data in src/datamodel_code_generator/model/pydantic_v2/base_model.py through _process_validators into @field_validator decorators without safe validation, allowing Python code execution when the generated Pydantic v2 model is imported. This issue is fixed in version 0.60.2.
Weakness: CWE-94
Which versions are affected by CVE-2026-54656?
3 open source packages ship an affected version, including datamodel-code-generator. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
datamodel-code-generator PyPI | From 0.52.1 | 0.60.2 |
datamodel-code-generator PyPI | From 0.52.1 | 0.60.2 |
datamodel-code-generator PyPI | From 0.52.1 | 0.60.2 |
Products include Koxudaxi Datamodel-Code-Generator.
How do I fix CVE-2026-54656?
Upgrade datamodel-code-generator to 0.60.2 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-54656 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-54656 exists.
Other vulnerabilities in koxudaxi datamodel-code-generator
- CVE-2026-54653 `datamodel-code-generator` vulnerable to code injection in via attacker-controlled `default_factory` schema field
- CVE-2026-54690 datamodel-code-generator vulnerable to SSRF via JSON-Schema `$ref` to HTTP URL (silent by default)
- CVE-2026-55389 datamodel-code-generator vulnerable to arbitrary local file read via JSON-Schema `$ref` (`file://` and `../` traversal), bypassing `--no-allow-remote-refs`
- CVE-2026-55391 datamodel-code-generator vulnerable to SSRF protection bypass via DNS rebinding
- CVE-2026-55415 datamodel-code-generator vulnerable to code injection via `x-python-import` / `customTypePath` in generated import statements
Sources
Also known as GHSA-8m8r-38jm-f355, PYSEC-2026-3559.