basic-ftp allows a malicious FTP server to cause client-side denial of service via unbounded multiline control response buffering_CVE-2026-44240

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-05-12T20:37:43.098Z",
    "modified": "2026-05-12T20:37:43.098Z",
    "type": "cve",
    "title": "basic-ftp allows a malicious FTP server to cause client-side denial of service via unbounded multiline control response buffering",
    "source": "GitHub_M",
    "references": "https://github.com/patrickjuchli/basic-ftp/security/advisories/GHSA-rpmf-866q-6p89",
    "id": "CVE-2026-44240",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400",
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "patrickjuchli basic-ftp < 5.3.1",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "basic-ftp",
    "version": "< 5.3.1",
    "vendor": "patrickjuchli",
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    "ai_score": 0
}