CVE-2026-44240
published 2026-05-12CVE-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…
PriorityP345high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.46%
36.8th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| patrickjuchli | basic-ftp | < 5.3.1 | 5.3.1 |
| patrickjuchli | basic-ftp | >= 0 < 5.3.1 | 5.3.1 |
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VulDB
patrickjuchli basic-ftp up to 5.3.0 FTP Endpoint connect resource consumption
vuldb·2026-05-12
CVE-2026-44240 [LOW] patrickjuchli basic-ftp up to 5.3.0 FTP Endpoint connect resource consumption
A vulnerability was found in patrickjuchli basic-ftp up to 5.3.0 and classified as problematic. Affected by this vulnerability is the function connect of the component FTP Endpoint. Such manipulation leads to resource consumption.
This vulnerability is traded as CVE-2026-44240. The attack may be launched remotely. There is no exploit available.
It is suggested to upgrade the affected component.
GHSA
basic-ftp allows a malicious FTP server to cause client-side denial of service via unbounded multiline control response buffering
ghsa·2026-05-06
CVE-2026-44240 [HIGH] CWE-400 basic-ftp allows a malicious FTP server to cause client-side denial of service via unbounded multiline control response buffering
basic-ftp allows a malicious FTP server to cause client-side denial of service via unbounded multiline control response buffering
## Summary
`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, w
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-05-12
Published