{"id":"EM-20261109-4586","url":"https://cyber.eventmonitor.net/incident/EM-20261109-4586/critical-fastapi-code-generator-vulnerability-cve-2026-63471/","type":"cve","title":"Critical fastapi-code-generator Vulnerability (CVE-2026-63471)","subtitle":"CVE-2026-63471","subject":"CVE-2026-63471","status":"Developing","severity":"critical","affected":[],"headline":null,"born":"2026-11-09T19:48:08.000Z","firstSignal":"2026-11-03T20:18:15.753Z","lastSignal":"2026-11-09T19:48:08.000Z","updated":"2026-11-09T20:54:22.269Z","revision":1,"life":[{"status":"Born","at":"2026-11-09T19:48:08.000Z","why":"second independent source: C29 CIRCL Vulnerability-Lookup"},{"status":"Developing","at":"2026-11-09T19:48:08.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-03T20:18:15.753Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-09T19:48:08.000Z","what":"Born: second source, C29 CIRCL Vulnerability-Lookup. Page EM-20261109-4586 created."},{"at":"2026-11-09T19:48:08.000Z","what":"Source joined: C26 GitHub Advisory Database"}],"stages":[{"name":"Disclosed","at":"2026-11-03T20:18:15.753Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-03T20:18:15.753Z","detail":"CVSS 9.3 · EPSS 0.3%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":null,"detail":"None in sources yet"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-03T20:18:15.753Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":4,"title":"CVE-2026-63471 (CVSS 9.3)","text":"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…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63471"},{"at":"2026-11-09T19:48:08.000Z","source":"C29","sourceName":"CIRCL Vulnerability-Lookup","role":"Database","severity":2,"title":"GHSA-p2mm-64f6-gmpp / CVE-2026-63471","text":"fastapi-code-generator: Import-time RCE via route path -> unescaped @app.get('...') decorator","url":"https://vulnerability.circl.lu/vuln/GHSA-p2mm-64f6-gmpp"},{"at":"2026-11-09T19:48:08.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":4,"title":"GHSA-p2mm-64f6-gmpp / CVE-2026-63471: fastapi-code-generator: Import-time RCE via route path -> unescaped @app.get('...') decorator","text":"pip:fastapi-code-generator","url":"https://github.com/advisories/GHSA-p2mm-64f6-gmpp"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-03T20:18:15.753","score":9.3,"severity":"CRITICAL","desc":"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…","product":"","seen":1794032737048},"kev":null,"epss":{"epss":0.00312,"pct":0.24264,"at":1793803438877},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}