CVE-2026-67192: Xlight FTP Server

High severity, CVSS 8.1. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Xlight Xlight FTP Server: before 3.9.5 (fixed in 3.9.5)

Published 2026-07-29. Last modified 2026-07-30.