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

Attack Vector Adjacent Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
QNAP Systems Inc. HBS 3 Hybrid Backup Sync unaffected
Version Status Constraints
26.4.x affected < 26.4.0.521
QNAP Systems Inc. Hybrid Backup Sync unaffected
Version Status Constraints
26.4.x affected < 26.4.0.521
26.4.x affected < 26.4.1.563

No data.

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

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

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.qnap.com/en/app-release-notes?keyword=HBS%203&app=HybridBackup&product-line=nas cve-icon cve-icon
https://www.qnap.com/en/app-release-notes?keyword=Hybrid&app=HybridBackup&product-line=nas cve-icon cve-icon
History

Thu, 29 Oct 2026 07:45:00 +0000

Type Values Removed Values Added
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
Title Hard-coded Cryptographic Key #1
Weaknesses CWE-321
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: qnap

Published:

Updated: 2026-10-29T07:39:53.736Z

Reserved: 2025-10-24T02:43:45.371Z

Link: CVE-2025-62839

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-29T08:16:59.863

Modified: 2026-10-29T08:17:00.010

Link: CVE-2025-62839

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-29T09:00:16Z

Weaknesses