Description
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.
We have already fixed the vulnerability in the following versions:
QTS 5.2.7.3256 build 20250913 and later
QuTS hero h5.2.7.3256 build 20250913 and later
QuTS hero h5.3.1.3250 build 20250912 and later
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| QNAP Systems | QTS | 5.2.x – < 5.2.7.3256 build 20250913 | 5.2.7.3256 build 20250913 |
| QNAP Systems | QuTS hero | h5.3.x – < h5.3.1.3250 build 20250912, h5.2.x – < h5.2.7.3256 build 20250913 | h5.3.1.3250 build 20250912 |
Advisories 1
- WID-SEC-2026-0011 QNAP NAS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jan 4, 2026