Allocation of Resources Without Limits or Throttling in basic-ftp - CVE-2026-44240
Published: April 28, 2026
Vulnerability identifier: #VU128255
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-44240
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in FtpContext._partialResponse and FTP control response parsing when processing unterminated multiline control-channel responses during the initial FTP banner phase. A remote attacker can send a specially crafted FTP server banner to cause a denial of service.
The issue is triggered before authentication, and no additional user interaction is required after the application initiates a normal FTP connection.
Affected software
basic-ftp
How to mitigate CVE-2026-44240
Install security update from vendor's website.
basic-ftp - update to 5.3.1