CVE-2026-63469 fastapi-code-generator: Import-time RCE via response status-code key -> unescaped @app.get(..., responses={...}) dict
CriticalCVSS 9.3
EPSS 0.31%
- Published
- Updated
- Exploit status
- No public exploit known
Description
fastapi-code-generator creates FastAPI applications from OpenAPI files. Prior to 0.8.1, the generator inserts an additional response status-code key into the generated responses={...} route-decorator dictionary as a single-quoted Python string without escaping embedded quotes. A multi-response OpenAPI operation with an attacker-controlled or attacker-influenced second non-primary response key can close the dictionary-key literal and inject a valid Python expression. Syntax-breaking input only causes generation to fail, but syntactically valid generated code executes with the application's or CI process's privileges when the generated module is imported and its decorator arguments are evaluated. This additional-response-key sink is distinct from the project's separate route-path and operation-summary sinks. This issue is fixed in version 0.8.1.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypi fastapi-code-generator(PyPI) | < 0.8.1 | 0.8.1 |
| pypi fastapi-code-generator(PyPI) | = 0.0.1 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.10 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.11 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.12 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.13 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.14 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.15 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.16 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.17 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.18 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.19 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.2 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.3 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.4 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.5 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.6 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.7 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.8 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.0.9 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.1.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.1.1 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.1 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.2 | No fix listed |
Show 27 more
| Product | Affected versions | Fixed in |
|---|---|---|
| pypi fastapi-code-generator(PyPI) | = 0.2.3 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.4 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.5 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.6 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.2.7 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.1 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.2 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.3 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.4 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.5 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.3.6 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.4.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.4.1 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.4.2 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.4.3 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.4.4 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.5.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.5.1 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.5.2 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.5.3 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.5.3rc0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.5.4 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.6.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.7.0 | No fix listed |
| pypi fastapi-code-generator(PyPI) | = 0.8.0 | No fix listed |
| koxudaxi fastapi-code-generator | = < 0.8.1 | No fix listed |
References
- https://github.com/koxudaxi/fastapi-code-generator/security/advisories/GHSA-6xmv-cjr5-w3q8 exploit vendor-advisory
- nvd.nist.gov third-party-advisory vendor-advisory
- https://github.com/koxudaxi/fastapi-code-generator/commit/49301dbdb82170d7f50877419d994b05cb1fa2bc patch
- https://github.com/koxudaxi/fastapi-code-generator/commit/b3b9bd66e0b0c4d8c686fda700258104615a1332 patch
- github.com product
- https://github.com/koxudaxi/fastapi-code-generator/releases/tag/0.8.1
- github.com