Uncaught Exception in basic-ftp - CVE-2026-126345
Published: November 10, 2026 / Updated: November 13, 2026
Vulnerability identifier: #VU164368
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126345
CWE-ID: CWE-248
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service in applications using basic-ftp.
The vulnerability exists due to an uncaught exception in the MLSD directory-listing parser when an unguarded dictionary lookup resolves the __proto__ fact name to Object.prototype and attempts to call it as a function. A remote attacker can return "__proto__=x;type=file;size=10; evil.txt" from a malicious FTP server or inject it into a plaintext FTP listing to reject Client.list() operations and terminate the calling process if the rejection is unhandled.
Affected software
basic-ftp
How to mitigate CVE-2026-126345
Install security update from vendor's website.
basic-ftp - update to 6.2.4