CVE-2025-62839: An use of hard-coded cryptographic key vulnerability has been reported to affect HBS 3 Hybrid Backup
Source GCVE Database
Not known to be exploited · CVSS 8.7 High : upgrade to 26.4.0.521 soon.
Data as of 29 Oct 2026, 10:21 UTC
Thin evidence
One scorer or none| CNA (qnap) | CVSS 4.0 | 8.7 |
|---|
- Patch
- Available – fixed in 26.4.0.521, 26.4.1.563
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 29 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade HBS 3 Hybrid Backup Sync to 26.4.0.521; Hybrid Backup Sync to 26.4.1.563 or 26.4.0.521.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| QNAP Systems Inc.HBS 3 Hybrid Backup Sync | Affected
| Fixed in
|
| QNAP Systems Inc.Hybrid Backup Sync | Affected
| Fixed in
|
| QNAP Systems Inc.Hybrid Backup Sync | Affected
| Fixed in
|
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