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CVE-2025-62839

Hard-coded Cryptographic Key #1

HIGH
8.7
CVSS Score
Published: October 29, 2026 at 07:39 AM UTC
Updated: October 29, 2026 at 03:17 PM UTC
1 product affected across 1 vendorHybrid Backup Sync

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Severity
HIGH8.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Release Notes
Source: cverecord
https://www.qnap.com/en/app-release-notes?keyword=HBS%203&app=HybridBackup&product-line=nas
Release Notes
Source: cverecord
https://www.qnap.com/en/app-release-notes?keyword=Hybrid&app=HybridBackup&product-line=nas

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHqnap
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-321

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