CVE-2026-32759

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This causes the server to fire after_upload exec hooks with empty or partial files, enabling an attacker to repeatedly trigger any configured hook with arbitrary filenames and zero bytes written. The impact ranges from DoS through expensive processing hooks, to command injection amplification when combined with malicious filenames, to abuse of upload-driven workflows like S3 ingestion or database inserts. Even without exec hooks enabled, the negative Upload-Length creates inconsistent cache entries where files are marked complete but contain no data. All deployments using the TUS upload endpoint (/api/tus) are affected, with the enableExec flag escalating the impact from cache inconsistency to remote command execution. This feature has been disabled by default for all installations from v2.33.8 onwards, including for existent installations. To exploit this vulnerability, the instance administrator must turn on a feature and ignore all the warnings about known vulnerabilities."}, {"lang": "es", "value": "Navegador de Archivos es una interfaz de gesti\u00f3n de archivos para subir, eliminar, previsualizar, renombrar y editar archivos dentro de un directorio especificado. En las versiones 2.61.2 e inferiores, el gestor de carga reanudable TUS analiza el encabezado Upload-Length como un entero con signo de 64 bits sin validar que el valor no sea negativo, permitiendo a un usuario autenticado proporcionar un valor negativo que satisface instant\u00e1neamente la condici\u00f3n de finalizaci\u00f3n de la carga tras la primera solicitud PATCH. Esto hace que el servidor dispare ganchos de ejecuci\u00f3n 'after_upload' con archivos vac\u00edos o parciales, permitiendo a un atacante activar repetidamente cualquier gancho configurado con nombres de archivo arbitrarios y cero bytes escritos. El impacto abarca desde DoS a trav\u00e9s de ganchos de procesamiento costosos, hasta la amplificaci\u00f3n de la inyecci\u00f3n de comandos cuando se combina con nombres de archivo maliciosos, hasta el abuso de flujos de trabajo impulsados por la carga como la ingesta de S3 o las inserciones en la base de datos. Incluso sin los ganchos de ejecuci\u00f3n habilitados, el Upload-Length negativo crea entradas de cach\u00e9 inconsistentes donde los archivos se marcan como completos pero no contienen datos. Todas las implementaciones que utilizan el punto final de carga TUS (/api/tus) se ven afectadas, con la bandera 'enableExec' escalando el impacto desde la inconsistencia de la cach\u00e9 hasta la ejecuci\u00f3n remota de comandos. En el momento de la publicaci\u00f3n, no hab\u00eda ning\u00fan parche o mitigaci\u00f3n disponible para abordar este problema."}], "id": "CVE-2026-32759", "lastModified": "2026-06-17T10:36:20.253", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "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": 5.3, "baseSeverity": "MEDIUM", "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L/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": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32759", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-20T16:47:43.694106Z", "version": "2.0.3"}}]}, "published": "2026-03-20T00:16:17.270", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/filebrowser/filebrowser/issues/5199"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-ffx7-75gc-jg7c"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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