{"id":"EM-20261109-95VR","url":"https://cyber.eventmonitor.net/incident/EM-20261109-95VR/critical-fastapi-code-generator-vulnerability-cve-2026-63469/","type":"cve","title":"Critical fastapi-code-generator Vulnerability (CVE-2026-63469)","subtitle":"CVE-2026-63469","subject":"CVE-2026-63469","status":"Developing","severity":"critical","affected":[],"headline":null,"born":"2026-11-09T19:46:27.000Z","firstSignal":"2026-11-03T20:18:15.420Z","lastSignal":"2026-11-09T19:46:27.000Z","updated":"2026-11-09T20:54:22.269Z","revision":1,"life":[{"status":"Born","at":"2026-11-09T19:46:27.000Z","why":"second independent source: C29 CIRCL Vulnerability-Lookup"},{"status":"Developing","at":"2026-11-09T19:46:27.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-03T20:18:15.420Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-09T19:46:27.000Z","what":"Born: second source, C29 CIRCL Vulnerability-Lookup. Page EM-20261109-95VR created."},{"at":"2026-11-09T19:46:27.000Z","what":"Source joined: C26 GitHub Advisory Database"}],"stages":[{"name":"Disclosed","at":"2026-11-03T20:18:15.420Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-03T20:18:15.420Z","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":"2026-11-03T20:18:15.420Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":4,"title":"CVE-2026-63469 (CVSS 9.3)","text":"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…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63469"},{"at":"2026-11-09T19:46:27.000Z","source":"C29","sourceName":"CIRCL Vulnerability-Lookup","role":"Database","severity":2,"title":"GHSA-6xmv-cjr5-w3q8 / CVE-2026-63469","text":"fastapi-code-generator: Import-time RCE via response status-code key -> unescaped @app.get(..., responses={...}) dict","url":"https://vulnerability.circl.lu/vuln/GHSA-6xmv-cjr5-w3q8"},{"at":"2026-11-09T19:46:27.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":4,"title":"GHSA-6xmv-cjr5-w3q8 / CVE-2026-63469: fastapi-code-generator: Import-time RCE via response status-code key -> unescaped @app.get(..., responses={...}) dict","text":"pip:fastapi-code-generator","url":"https://github.com/advisories/GHSA-6xmv-cjr5-w3q8"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-03T20:18:15.420","score":9.3,"severity":"CRITICAL","desc":"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…","product":"","seen":1794248262419},"kev":null,"epss":{"epss":0.00312,"pct":0.24264,"at":1793803438877},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}