CVE-2026-26241
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 · uneditedA buffer overflow vulnerability has been reported to affect File Station 5. The remote attackers can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5243 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 · moderate confidenceA buffer overflow vulnerability in QNAP File Station 5 allows remote attackers to overflow a buffer and modify memory or crash processes. The critical CVSS 9.1 score suggests unauthenticated network exploitation is possible.
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>= 5.5.6.4691, < 5.5.6.5243CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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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Locate File Station 5 installationAccess QNAP QTS admin interface, navigate to App Center, and locate File Station 5 in the installed applications list. Alternatively, use the QNAP command line and run 'qpkg -i' to list installed packages and find File Station 5.Affected if File Station 5 is not installed or is a different major version (e.g., File Station 6)
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Identify the installed version numberIn the QTS App Center, click on File Station 5 and view the version information displayed. From command line, run 'qpkg -g FileStation' or check the package configuration in /share/CACHEDEV1_DATA/.qpkg/FileStation/ to retrieve the version metadata.Affected if Cannot retrieve a version number or File Station 5 is not listed as an installed package
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Compare version against affected rangeParse the retrieved version (format: x.y.z.build) and check if it falls within the range >= 5.5.6.4691 and < 5.5.6.5243. For example, versions 5.5.6.4700, 5.5.6.5000, and 5.5.6.5242 are all within the affected range.Affected if The installed version is 5.5.6.4691 or any subsequent build up to and including 5.5.6.5242 (i.e., version >= 5.5.6.4691 AND version < 5.5.6.5243)
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Confirm File Station is network-facingVerify that the QNAP device has File Station remote access or web-based access enabled. Check QTS Control Panel > Network & File Services > Web Server > Enable Web File Station, or verify that the File Station service is bound to external interfaces rather than localhost only.Affected if File Station is exposed to network requests (the vulnerability is network-exploitable through the web interface)
You are affected if File Station 5 is installed with a version between 5.5.6.4691 and 5.5.6.5242 inclusive and the service is accessible over the network.
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 · scoped5.5.6.5243
Update File Station 5 to version 5.5.6.5243 or later to apply the vendor patch. This is a straightforward version upgrade requiring no code changes.
File Station 5.5.6.5243
- Log in to the QNAP NAS management interface (QTS or QuTScloud)
- Navigate to the App Center
- Locate File Station in the list of installed applications
- Check the current version to confirm it is vulnerable (less than 5.5.6.5243)
- Click the Update button or manually update File Station to version 5.5.6.5243 or later
- Verify the update was successful by checking the File Station version after completion
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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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-26241 — 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-2026-26241 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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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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