CVE-2025-62839 Hard-coded Cryptographic Key #1
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2025-62839?
CVE-2025-62839 is a high-severity vulnerability in QNAP Systems Inc. HBS 3 Hybrid Backup Sync, published on 29 Oct 2026.
Official description
An use of hard-coded cryptographic key vulnerability has been reported to affect HBS 3 Hybrid Backup Sync and Hybrid Backup Sync. If exploited, the vulnerability could allow remote attackers to compromise the security of the system.
We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.4.0.521 and later Hybrid Backup Sync 26.4.0.521 and later Hybrid Backup Sync 26.4.1.563 and later
Weakness: CWE-321
Which versions are affected by CVE-2025-62839?
How do I fix CVE-2025-62839?
No fix has been published for CVE-2025-62839 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-62839 being exploited?
There is no known exploitation of CVE-2025-62839 in the wild and no public exploit code.
Sources
Also known as GHSA-7m89-78rx-fg5j.