CVE-2026-54621 `datamodel-code-generator` vulnerable to code injection via unescaped carriage return in GraphQL Union description
Attackers can inject Python code into generated models via GraphQL schema descriptions, leading to code execution when the models are imported.
- 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-2026-54621?
CVE-2026-54621 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 Python data models from schema definitions. Prior to 0.60.1, GraphQL Union description values in src/datamodel_code_generator/model/template/UnionTypeStatement.jinja2 and src/datamodel_code_generator/model/template/UnionTypeStatement.py312.jinja2 are rendered into Python comments without neutralizing carriage returns in Python # comments, allowing attacker-controlled GraphQL schema content to inject Python code into generated models that runs when imported. This issue is fixed in version 0.60.1.
Which versions are affected by CVE-2026-54621?
3 open source packages ship an affected version, including datamodel-code-generator.
| Package | Affected | Fixed in |
|---|---|---|
datamodel-code-generator PyPI | From 0.25.0 | 0.60.1 |
datamodel-code-generator PyPI | From 0.25.0 | 0.60.1 |
datamodel-code-generator PyPI | From 0.25.0 | 0.60.1 |
How do I fix CVE-2026-54621?
Upgrade datamodel-code-generator to 0.60.1 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-54621 being exploited?
There is no known exploitation of CVE-2026-54621 in the wild and no public exploit code.
Sources
Also known as GHSA-j884-q54q-mmx3, MINI-2wqq-fw2v-jx44, PYSEC-2026-3561.