CVE-2026-67192 Xlight FTP Server < 3.9.5 Pre-Auth Stack Buffer Overflow via SSH GCM Cipher
Unauthenticated attackers can achieve remote code execution on Xlight FTP Server by sending malformed SSH packets that trigger a stack buffer overflow.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67192?
CVE-2026-67192 is a critical memory corruption vulnerability in Xlight FTP Server, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-121
Which versions are affected by CVE-2026-67192?
How do I fix CVE-2026-67192?
No fix has been published for CVE-2026-67192 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-67192 being exploited?
There is no known exploitation of CVE-2026-67192 in the wild and no public exploit code.
Sources
Also known as GHSA-pvvv-gmf8-6fw8.