CVE-2026-67192

High

Description

Xlight FTP Server before 3.9.5 contains a pre-authentication stack buffer overflow vulnerability that allows unauthenticated attackers to corrupt stack memory by sending malformed SSH packets when a GCM cipher is negotiated. Attackers can craft packets with an unvalidated length field passed directly to the GCM decrypt function, overwriting the stack cookie and return address to potentially achieve remote code execution before any authentication occurs.

SeverityHigh

CVSS8.1

Exploit probability—

ProductXlight FTP Server

PublishedJul 29, 2026

First seenJul 29, 2026

Weakness typeCWE-121CWE-121

How to fix

Update

Xlight Xlight FTP Server3.9.5 or later

Vendor advisories

xlightftpd.com/whatsnew.htm

Affected products

Product	Affected versions	Fixed in
Xlight Xlight FTP Server	v < 3.9.5	3.9.5

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