{"id":"CVE-2026-44240","sourceIdentifier":"security-advisories@github.com","published":"2026-05-12T21:16:16.410","lastModified":"2026-10-26T17:10:03.270","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"basic-ftp is an FTP client for Node.js. Prior to 5.3.1, basic-ftp is vulnerable to client-side denial of service when parsing FTP control-channel multiline responses. A malicious or compromised FTP server can send an unterminated multiline response during the initial FTP banner phase, before authentication. The client keeps appending attacker-controlled data into FtpContext._partialResponse and repeatedly reparses the accumulated buffer without enforcing a maximum control response size. As a result, an application using basic-ftp can remain stuck in connect() while memory and CPU usage grow under attacker-controlled input. This can lead to process-level denial of service, container OOM kills, worker restarts, queue backlog, or service degradation in applications that automatically connect to FTP endpoints. This vulnerability is fixed in 5.3.1."},{"lang":"es","value":"basic-ftp es un cliente FTP para Node.js. Antes de la 5.3.1, basic-ftp es vulnerable a una denegación de servicio del lado del cliente al analizar respuestas multilínea del canal de control FTP. Un servidor FTP malicioso o comprometido puede enviar una respuesta multilínea no terminada durante la fase inicial del banner FTP, antes de la autenticación. El cliente sigue añadiendo datos controlados por el atacante en FtpContext._partialResponse y vuelve a analizar repetidamente el búfer acumulado sin aplicar un tamaño máximo de respuesta de control. Como resultado, una aplicación que utiliza basic-ftp puede quedarse atascada en connect() mientras el uso de memoria y CPU crece bajo la entrada controlada por el atacante. Esto puede llevar a denegación de servicio a nivel de proceso, eliminaciones OOM de contenedores, reinicios de trabajadores, acumulación de cola o degradación del servicio en aplicaciones que se conectan automáticamente a puntos finales FTP. Esta vulnerabilidad está corregida en la versión 5.3.1."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"patrickjuchli","product":"basic-ftp","versions":[{"version":"< 5.3.1","status":"affected"}]}]}],"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:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-14T12:31:54.775969Z","id":"CVE-2026-44240","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-400"},{"lang":"en","value":"CWE-770"}]}],"references":[{"url":"https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rpmf-866q-6p89","source":"security-advisories@github.com"},{"url":"https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rpmf-866q-6p89","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}