CVE-2026-34009 **Container Escape** Host user home directory mounted with write access into application container
A local administrator can escape the application container to compromise the host system due to improper isolation of the home directory.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34009?
CVE-2026-34009 is a high-severity vulnerability in QNAP Systems Inc. Notes Station 3, published on 15 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An improper isolation or compartmentalization vulnerability has been reported to affect Notes Station 3. If a local attacker gains an administrator account, they can then exploit the vulnerability to compromise the security of the system.
We have already fixed the vulnerability in the following version: Notes Station 3 3.9.11 and later
Weakness: CWE-653
Which versions are affected by CVE-2026-34009?
How do I fix CVE-2026-34009?
No fix has been published for CVE-2026-34009 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-34009 being exploited?
There is no known exploitation of CVE-2026-34009 in the wild and no public exploit code.
Sources
Also known as GHSA-qj84-cjxx-3366.