CVE-2026-44240: high-severity vulnerability in patrickjuchli basic-ftp
basic-ftp allows a malicious FTP server to cause client-side denial of service via unbounded multiline control response buffering
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.5%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
patrickjuchli · basic-ftpRelated CVEs — patrickjuchli basic-ftp
In the same product, most dangerous first.
CVE-2026-39983HIGHFTP Command Injection via CRLF in basic-ftpEPSS 2.2%CVE-2026-27699CRITICALBasic FTP has Path Traversal Vulnerability in its downloadToDir() methodEPSS 0.9%CVE-2026-102990HIGHbasic-ftp: Quadratic-time CPU denial of service in Client.list() Unix directory-listing parser (RE_LINE backtracking)EPSS 0.4%CVE-2026-41324HIGHbasic-ftp vulnerable to denial of service via unbounded memory consumption in Client.list()EPSS 0.3%