{"id":"EM-20261109-97SJ","url":"https://cyber.eventmonitor.net/incident/EM-20261109-97SJ/critical-fastapi-code-generator-vulnerability-cve-2026-63470/","type":"cve","title":"Critical fastapi-code-generator Vulnerability (CVE-2026-63470)","subtitle":"CVE-2026-63470","subject":"CVE-2026-63470","status":"Developing","severity":"critical","affected":[],"headline":null,"born":"2026-11-09T18:50:00.000Z","firstSignal":"2026-11-03T20:18:15.590Z","lastSignal":"2026-11-09T18:50:00.000Z","updated":"2026-11-09T19:33:27.959Z","revision":1,"life":[{"status":"Born","at":"2026-11-09T18:50:00.000Z","why":"second independent source: C29 CIRCL Vulnerability-Lookup"},{"status":"Developing","at":"2026-11-09T18:50:00.000Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-03T20:18:15.590Z","what":"First signal: C6 NVD CVE API 2.0"},{"at":"2026-11-09T18:50:00.000Z","what":"Born: second source, C29 CIRCL Vulnerability-Lookup. Page EM-20261109-97SJ created."},{"at":"2026-11-09T18:50:00.000Z","what":"Source joined: C26 GitHub Advisory Database"}],"stages":[{"name":"Disclosed","at":"2026-11-03T20:18:15.590Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-03T20:18:15.590Z","detail":"CVSS 9.3 · EPSS 0.5%"},{"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":"2026-11-03T20:18:15.590Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":4,"title":"CVE-2026-63470 (CVSS 9.3)","text":"fastapi-code-generator creates FastAPI applications from OpenAPI files. Prior to 0.8.1, the generator inserts Operation.summary into a generated route-handler docstring as a triple-double-quoted string without escaping embedded triple quotes. An attacker-controlled or attacker-influenced operation summary can close the docstring and inject a valid Python expression statement into the handler body. Syntax-breaking input only causes generation to fail, but syntactically valid generated code executes with the server process's privileges when the affected route handler is called. This call-time…","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63470"},{"at":"2026-11-09T18:50:00.000Z","source":"C29","sourceName":"CIRCL Vulnerability-Lookup","role":"Database","severity":2,"title":"GHSA-h667-4jj2-cgv4 / CVE-2026-63470","text":"fastapi-code-generator: Call-time RCE via operation summary -> unescaped route-handler docstring","url":"https://vulnerability.circl.lu/vuln/GHSA-h667-4jj2-cgv4"},{"at":"2026-11-09T18:50:00.000Z","source":"C26","sourceName":"GitHub Advisory Database","role":"Database","severity":4,"title":"GHSA-h667-4jj2-cgv4 / CVE-2026-63470: fastapi-code-generator: Call-time RCE via operation summary -> unescaped route-handler docstring","text":"pip:fastapi-code-generator","url":"https://github.com/advisories/GHSA-h667-4jj2-cgv4"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-03T20:18:15.590","score":9.3,"severity":"CRITICAL","desc":"fastapi-code-generator creates FastAPI applications from OpenAPI files. Prior to 0.8.1, the generator inserts Operation.summary into a generated route-handler docstring as a triple-double-quoted string without escaping embedded triple quotes. An attacker-controlled or attacker-influenced operation…","product":"","seen":1793803438877},"kev":null,"epss":{"epss":0.00468,"pct":0.40603,"at":1793803438877},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}