CVE-2025-54121

{"id": "CVE-2025-54121", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "published": "2025-07-21T20:15:41.827", "references": [{"url": "https://github.com/encode/starlette/blob/fa5355442753f794965ae1af0f87f9fec1b9a3de/starlette/datastructures.py#L436C5-L447C14", "source": "security-advisories@github.com"}, {"url": "https://github.com/encode/starlette/commit/9f7ec2eb512fcc3fe90b43cb9dd9e1d08696bec1", "source": "security-advisories@github.com"}, {"url": "https://github.com/encode/starlette/discussions/2927#discussioncomment-13721403", "source": "security-advisories@github.com"}, {"url": "https://github.com/encode/starlette/security/advisories/GHSA-2c2j-9gv5-cj73", "source": "security-advisories@github.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "Starlette is a lightweight ASGI (Asynchronous Server Gateway Interface) framework/toolkit, designed for building async web services in Python. In versions 0.47.1 and below, when parsing a multi-part form with large files (greater than the default max spool size) starlette will block the main thread to roll the file over to disk. This blocks the event thread which means the application can't accept new connections. The UploadFile code has a minor bug where instead of just checking for self._in_memory, the logic should also check if the additional bytes will cause a rollover. The vulnerability is fixed in version 0.47.2."}, {"lang": "es", "value": "Starlette es un framework/kit de herramientas ASGI (Interfaz de Puerta de Enlace de Servidor As\u00edncrona) ligero, dise\u00f1ado para crear servicios web as\u00edncronos en Python. En las versiones 0.47.1 y anteriores, al analizar un formulario multiparte con archivos grandes (superiores al tama\u00f1o m\u00e1ximo de spool predeterminado), Starlette bloquea el hilo principal para que no transfiera el archivo al disco. Esto bloquea el hilo de eventos, lo que impide que la aplicaci\u00f3n acepte nuevas conexiones. El c\u00f3digo UploadFile presenta un peque\u00f1o error: en lugar de simplemente comprobar self._in_memory, la l\u00f3gica tambi\u00e9n deber\u00eda comprobar si los bytes adicionales provocar\u00e1n una transferencia. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 0.47.2."}], "lastModified": "2025-07-22T13:05:40.573", "sourceIdentifier": "security-advisories@github.com"}