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node-proxy-agents — security advisory

Type: advisorySources: OSVAdvisory ID: DEBIAN-CVE-2026-44240

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.

Products
node-proxy-agents
Affected versions
0~2024040606-6, 0~2024040606-6+deb13u1, 0~2025070717+~cs15.2.7-1, 0~2025070717+~cs15.3.7-1, 0~2025070717+~cs15.3.8-1, 0~2025070717+~cs15.3.8-2, 0~2025070717+~cs15.3.8-3, 0~2025070717+~cs16.2.9-1, 0~2025070717-1, 0~2025070717-2, 0~2025070717-3, 0~2025070717-4, 0~2025070717-5, 0~2025070717-6
Fixed versions
0~2025070717+~cs15.3.8-1
CVEs
CVE-2026-44240
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 17:52 UTC · Revision 2

Source evidence

DEBIAN-CVE-2026-44240

core-osv · Original source

Published 12 May 2026, 21:16 UTC

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.

osv:DEBIAN-CVE-2026-44240

node-proxy-agents

Fixed versions: Not specified

node-proxy-agents

Fixed versions: 0~2025070717+~cs15.3.8-1

Complete source record
{
  "id": "82c95d4e7955e4ada63b79188a6be36ebb590ae48bf5a77324ff62d8ed2d560a",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-44240",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2026-44240",
    "summary": "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.",
    "evidence": "osv:DEBIAN-CVE-2026-44240",
    "products": [
      {
        "name": {
          "value": "node-proxy-agents",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "0~2024040606-6",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2024040606-6+deb13u1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717+~cs15.2.7-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717+~cs15.3.7-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717+~cs15.3.8-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717+~cs15.3.8-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717+~cs15.3.8-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717+~cs16.2.9-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717-2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717-3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717-4",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717-5",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0~2025070717-6",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "node-proxy-agents",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "0~2025070717+~cs15.3.8-1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "0~2024040606-6",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717+~cs15.2.7-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717+~cs15.3.7-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717-1",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717-2",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717-3",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717-4",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717-5",
            "evidence": "/affected/1/versions"
          },
          {
            "value": "0~2025070717-6",
            "evidence": "/affected/1/versions"
          }
        ]
      }
    ],
    "severity": "high",
    "structured": {
      "id": "DEBIAN-CVE-2026-44240",
      "aliases": [
        "DEBIAN-CVE-2026-44240"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "node-proxy-agents",
            "purl": "pkg:deb/debian/node-proxy-agents?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "0~2024040606-6",
            "0~2024040606-6+deb13u1",
            "0~2025070717+~cs15.2.7-1",
            "0~2025070717+~cs15.3.7-1",
            "0~2025070717+~cs15.3.8-1",
            "0~2025070717+~cs15.3.8-2",
            "0~2025070717+~cs15.3.8-3",
            "0~2025070717+~cs16.2.9-1",
            "0~2025070717-1",
            "0~2025070717-2",
            "0~2025070717-3",
            "0~2025070717-4",
            "0~2025070717-5",
            "0~2025070717-6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44240.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "0~2025070717+~cs15.3.8-1"
                }
              ]
            }
          ],
          "package": {
            "name": "node-proxy-agents",
            "purl": "pkg:deb/debian/node-proxy-agents?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "0~2024040606-6",
            "0~2025070717+~cs15.2.7-1",
            "0~2025070717+~cs15.3.7-1",
            "0~2025070717-1",
            "0~2025070717-2",
            "0~2025070717-3",
            "0~2025070717-4",
            "0~2025070717-5",
            "0~2025070717-6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-44240.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-27T10:01:25.207045999Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-44240"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2026-44240"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-44240",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 461392,
  "published_at": "2026-05-12T21:16:16.41+00:00"
}