CVE-2026-44240

{
  "id": "CVE-2026-44240",
  "sourceIdentifier": "[email protected]",
  "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": "[email protected]",
      "affectedData": [
        {
          "vendor": "patrickjuchli",
          "product": "basic-ftp",
          "versions": [
            {
              "version": "< 5.3.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "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": "[email protected]",
      "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": "[email protected]"
    },
    {
      "url": "https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rpmf-866q-6p89",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
    }
  ]
}