CVE-2025-62842
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedAn external control of file name or path vulnerability has been reported to affect HBS 3 Hybrid Backup Sync. If an attacker gains local network access, they can then exploit the vulnerability to read or modify files or directories. We have already fixed the vulnerability in the following version: HBS 3 Hybrid Backup Sync 26.2.0.938 and later
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThis is a path traversal (external control of file name or path) vulnerability in QNAP's HBS 3 Hybrid Backup Sync application. An attacker with local network access can manipulate file paths in application requests to access files or directories outside the intended root directory, potentially reading or modifying sensitive data.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 26.2.0.938CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm HBS 3 Hybrid Backup Sync is installedLocate the Hybrid Backup Sync application on the QNAP system via the App Center or by checking for the HBS 3 process/serviceAffected if HBS 3 Hybrid Backup Sync is not present on the system, the vulnerability does not apply
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Identify installed HBS 3 versionAccess the QNAP App Center, click on Hybrid Backup Sync, and view the installed version number displayed in the application detailsAffected if The displayed version number is below 26.2.0.938
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Verify version via command line (if available)Use the QNAP CLI or check the package manifest if SSH access is available to retrieve the exact HBS 3 version stringAffected if The version retrieved is lower than 26.2.0.938
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Confirm network accessibility of HBS 3Check if the HBS 3 web interface or backup services are accessible from the local network, as the vulnerability requires local network access to exploitAffected if HBS 3 services are exposed on the network and the version is below 26.2.0.938
User is affected if HBS 3 Hybrid Backup Sync is installed and the installed version is lower than 26.2.0.938, regardless of network accessibility since the vulnerable code is present locally.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped26.2.0.938
Apply the vendor patch by upgrading HBS 3 Hybrid Backup Sync to version 26.2.0.938 or later. Restrict network access to trusted users as an additional layer of defense.
HBS 3 Hybrid Backup Sync 26.2.0.938 or later
- Access the QNAP NAS admin interface (QTS)
- Navigate to App Center
- Locate HBS 3 Hybrid Backup Sync in the installed applications
- Update HBS 3 Hybrid Backup Sync to version 26.2.0.938 or later
- Verify the update was successful by checking the installed version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA1.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-62842 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-62842 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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