patrickjuchli basic-ftp up to 5.3.0 FTP Endpoint connect resource consumption

Summaryinfo

A vulnerability was found in patrickjuchli basic-ftp up to 5.3.0. It has been classified as problematic. Affected by this issue is the function connect of the component FTP Endpoint. Performing a manipulation results in resource consumption. This vulnerability is known as CVE-2026-44240. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in patrickjuchli basic-ftp up to 5.3.0. This affects the function connect of the component FTP Endpoint. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-44240 since 05/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 5.3.1 eliminates this vulnerability.

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Productinfo

Vendor

• patrickjuchli

Name

• basic-ftp

Version

• 5.0
• 5.1
• 5.2
• 5.3.0

Website

• Product: https://github.com/patrickjuchli/basic-ftp/

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