CVE-2026-39803

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En lugar de limitar el cuerpo acumulado al l\u00edmite configurado (por ejemplo, los 8 MB predeterminados de Plug.Parsers), do_read_chunked_data!/5 almacena en b\u00fafer cada fragmento recibido en una iolist incondicionalmente y materializa el cuerpo completo como un \u00fanico binario. La funci\u00f3n siempre devuelve {:ok, body, ...}, por lo que los llamadores no pueden interponer una respuesta 413.\n\nDebido a que Plug.Parsers se ejecuta antes del enrutamiento y la autenticaci\u00f3n en el punto final est\u00e1ndar de Phoenix, un atacante no autenticado no necesita una ruta o credenciales v\u00e1lidas. El env\u00edo de una \u00fanica solicitud POST \u2019Transfer-Encoding: chunked\u2019 con un cuerpo arbitrariamente grande a cualquier ruta hace que el proceso BEAM agote la memoria disponible y sea terminado por el \u2019OOM killer\u2019 del sistema operativo.\n\nLa ruta \u2019content-length\u2019 en la misma funci\u00f3n aplica correctamente el l\u00edmite y no se ve afectada.\n\nEste problema afecta a bandit: desde la versi\u00f3n 1.4.0 hasta antes de la 1.11.1."}], "id": "CVE-2026-39803", "lastModified": "2026-10-26T14:10:00.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "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": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-39803", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-13T14:41:58.440838Z", "version": "2.0.3"}}]}, "published": "2026-05-13T14:17:32.633", "references": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://cna.erlef.org/cves/CVE-2026-39803.html"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"], "url": "https://github.com/mtrudel/bandit/commit/ae3520dfdbfab115c638f8c7f6f6b805db34e1ab"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-9q9q-324x-93r2"}, {"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Third Party Advisory"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-39803"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/mtrudel/bandit/security/advisories/GHSA-9q9q-324x-93r2"}], "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.4.0,1.11.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[903e209a521bc216b9f9065c01ae9a0cac2d5a10,ae3520dfdbfab115c638f8c7f6f6b805db34e1ab)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "bandit", "vendor": "mtrudel"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.4.0,1.11.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "bandit", "source": "cna", "vendor": "mtrudel"}, "product": "bandit", "vendor": "mtrudel"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[903e209a521bc216b9f9065c01ae9a0cac2d5a10,ae3520dfdbfab115c638f8c7f6f6b805db34e1ab)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "bandit", "source": "cna", "vendor": "mtrudel"}, "product": "bandit", "vendor": "mtrudel"}], "created": "2026-05-13T16:30:36.725003+00:00", "updated": "2026-05-22T15:15:09.461993+00:00", "vendors": ["mtrudel", "mtrudel$PRODUCT$bandit"]}