Quick answers
- Is CVE-2025-62841 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-62841 being exploited in the wild.
- How severe is CVE-2025-62841?
- Informational severity, published 29 October 2026.
- Which products and versions are affected?
- QNAP HBS 3 Hybrid Backup Sync before 26.4.0.521; QNAP Hybrid Backup Sync before 26.4.0.521 (main track) or 26.4.1.563 (secondary track).
- Is there a fix for CVE-2025-62841?
- Yes: fixed in 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. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2025-62841 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2025-62841?
- Check whether you run QNAP HBS 3 Hybrid Backup Sync or QNAP Hybrid Backup Sync at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 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
Technical details
The vulnerability involves the use of a hard-coded cryptographic key in HBS 3 Hybrid Backup Sync and Hybrid Backup Sync. This allows remote attackers to potentially compromise the security of the system. The fix has been addressed in patched versions of both product lines.
Affected products
- QNAP HBS 3 Hybrid Backup Sync before 26.4.0.521
- QNAP Hybrid Backup Sync before 26.4.0.521 (main track) or 26.4.1.563 (secondary track)
Timeline
- 2026-10-29: advisory