CVE-2024-47874

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This allows an attacker to upload arbitrary large form fields and cause Starlette to both slow down significantly due to excessive memory allocations and copy operations, and also consume more and more memory until the server starts swapping and grinds to a halt, or the OS terminates the server process with an OOM error. Uploading multiple such requests in parallel may be enough to render a service practically unusable, even if reasonable request size limits are enforced by a reverse proxy in front of Starlette. This Denial of service (DoS) vulnerability affects all applications built with Starlette (or FastAPI) accepting form requests. Verison 0.40.0 fixes this issue."}, {"lang": "es", "value": "Starlette es un conjunto de herramientas/marco de interfaz de puerta de enlace de servidor asincr\u00f3nico (ASGI). Antes de la versi\u00f3n 0.40.0, Starlette trata las partes `multipart/form-data` sin un `filename` como campos de formulario de texto y las almacena en b\u00fafer en cadenas de bytes sin l\u00edmite de tama\u00f1o. Esto permite a un atacante cargar campos de formulario arbitrarios de gran tama\u00f1o y hacer que Starlette se ralentice significativamente debido a asignaciones de memoria excesivas y operaciones de copia, y tambi\u00e9n consuma cada vez m\u00e1s memoria hasta que el servidor comienza a intercambiar y se detiene, o el sistema operativo finaliza el proceso del servidor con un error OOM. Cargar m\u00faltiples solicitudes de este tipo en paralelo puede ser suficiente para dejar un servicio pr\u00e1cticamente inutilizable, incluso si se aplican l\u00edmites de tama\u00f1o de solicitud razonables mediante un proxy inverso frente a Starlette. Esta vulnerabilidad de denegaci\u00f3n de servicio (DoS) afecta a todas las aplicaciones creadas con Starlette (o FastAPI) que aceptan solicitudes de formulario. La versi\u00f3n 0.40.0 corrige este problema."}], "id": "CVE-2024-47874", "lastModified": "2026-06-17T07:57:53.817", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-47874", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-15T16:23:43.595198Z", "version": "2.0.3"}}]}, "published": "2024-10-15T16:15:05.260", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/encode/starlette/commit/fd038f3070c302bff17ef7d173dbb0b007617733"}, {"source": "security-advisories@github.com", "url": "https://github.com/encode/starlette/security/advisories/GHSA-f96h-pmfr-66vw"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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