{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-18T02:25:36.442","vulnerabilities":[{"cve":{"id":"CVE-2021-32677","sourceIdentifier":"security-advisories@github.com","published":"2021-06-09T18:15:08.553","lastModified":"2024-11-21T06:07:30.713","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"FastAPI is a web framework for building APIs with Python 3.6+ based on standard Python type hints. FastAPI versions lower than 0.65.2 that used cookies for authentication in path operations that received JSON payloads sent by browsers were vulnerable to a Cross-Site Request Forgery (CSRF) attack. In versions lower than 0.65.2, FastAPI would try to read the request payload as JSON even if the content-type header sent was not set to application/json or a compatible JSON media type (e.g. application/geo+json). A request with a content type of text/plain containing JSON data would be accepted and the JSON data would be extracted. Requests with content type text/plain are exempt from CORS preflights, for being considered Simple requests. The browser will execute them right away including cookies, and the text content could be a JSON string that would be parsed and accepted by the FastAPI application. This is fixed in FastAPI 0.65.2. The request data is now parsed as JSON only if the content-type header is application/json or another JSON compatible media type like application/geo+json. It's best to upgrade to the latest FastAPI, but if updating is not possible then a middleware or a dependency that checks the content-type header and aborts the request if it is not application/json or another JSON compatible content type can act as a mitigating workaround."},{"lang":"es","value":"FastAPI es un framework web para construir APIs con Python versión 3.6+ basado en sugerencias de tipo estándar de Python. Las versiones de FastAPI inferiores a la 0.65.2 que usaban cookies para la autenticación en las operaciones de ruta que recibían cargas útiles JSON enviadas por los navegadores eran vulnerables a un ataque de tipo Cross-Site Request Forgery (CSRF). En versiones inferiores a la 0.65.2, FastAPI intentaba leer la carga útil de la petición como JSON incluso si la encabezado content-type enviada no estaba configurada como application/json o un tipo de medio JSON compatible (por ejemplo, application/geo+json). Una petición con un tipo de contenido text/plain que contenga datos JSON será aceptada y los datos JSON serán extraídos. Las peticiones con tipo de contenido text/plain están exentas de preflights CORS, por ser consideradas peticiones simples. El navegador las ejecutará de inmediato, incluyendo las cookies, y el contenido de texto podría ser una cadena JSON que sería analizada y aceptada por la aplicación FastAPI. Esto se ha corregido en FastAPI 0.65.2. Ahora los datos de la petición se analizan como JSON sólo si la encabezado content-type es application/json u otro tipo de medio compatible con JSON como application/geo+json. Es mejor actualizar a la última FastAPI, pero si la actualización no es posible, entonces un middleware o una dependencia que compruebe la encabezado de tipo de contenido y aborte la petición si no es application/json u otro tipo de contenido compatible con JSON puede actuar como una solución de mitigación"}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N","baseScore":8.2,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":4.2},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":5.2}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","baseScore":5.8,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE"},"baseSeverity":"MEDIUM","exploitabilityScore":8.6,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-352"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:tiangolo:fastapi:*:*:*:*:*:*:*:*","versionEndExcluding":"0.65.2","matchCriteriaId":"60506886-D0E8-4F9C-B900-D373A4435A4D"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","matchCriteriaId":"A930E247-0B43-43CB-98FF-6CE7B8189835"}]}]}],"references":[{"url":"https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MATAWX25TYKNEKLDMKWNLYDB34UWTROA/","source":"security-advisories@github.com"},{"url":"https://github.com/tiangolo/fastapi/commit/fa7e3c996edf2d5482fff8f9d890ac2390dede4d","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/tiangolo/fastapi/security/advisories/GHSA-8h2j-cgx8-6xv7","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MATAWX25TYKNEKLDMKWNLYDB34UWTROA/","source":"af854a3a-2127-422b-91ae-364da2661108"}]}}]}