Skip to content
Critical 9.3

fastapi-code-generator: Import-time RCE via route path -> unescaped @app.get('...') decorator

CVE-2026-63471 First seen on SecPulse
Original description The description as published by the source.

fastapi-code-generator creates FastAPI applications from OpenAPI files. Prior to 0.8.1, the generator inserts an OpenAPI path into a generated @app.get(...) route decorator as a single-quoted generated route string without escaping embedded quotes. An attacker-controlled or attacker-influenced OpenAPI path can close the string and inject a valid Python expression into the decorator argument. 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 the decorator is evaluated. This OpenAPI path sink is distinct from the project's separate operation-summary docstring and additional-response-key sinks. This issue is fixed in version 0.8.1.

Source: CVE.org (CVE Program・cvelistV5) NVD GitHub Advisory

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details