# 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.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** Yes
- **Published:** 28 Jul 2026
- **Updated:** 29 Jul 2026
- **Also known as:** GHSA-j884-q54q-mmx3, MINI-2wqq-fw2v-jx44, PYSEC-2026-3561

## 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.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-1336 (Improper Neutralization of Special Elements Used in a Template Engine)

## Which versions are affected by CVE-2026-54621?

3 open source packages ship an affected version, including datamodel-code-generator.


| Package | Ecosystem | 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.

## Is CVE-2026-54621 being exploited?

There is no known exploitation of CVE-2026-54621 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54621 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-54621 in the wild and no public exploit code.

Affected packages and fixed versions:
- datamodel-code-generator (PyPI): affected from 0.25.0; fixed in 0.60.1
- datamodel-code-generator (PyPI): affected from 0.25.0; fixed in 0.60.1
- datamodel-code-generator (PyPI): affected from 0.25.0; fixed in 0.60.1

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54621/ (Markdown: https://insights.sbomify.com/CVE-2026-54621/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54621
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54621
- OSV: https://osv.dev/vulnerability/CVE-2026-54621

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54621/
Summaries are generated and may contain mistakes; the official description above is the record.