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CVE-2026-26240

QNAP File Station buffer overflow

9.1 CRITICALEPSS 0.56%
  1. Published10 Jun 2026

Description

A 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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

QNAP File Station≥ 5.5.6.4691 < 5.5.6.5243

Remediation

Fixed in
QNAP File Station≥ 5.5.6.5243

References

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Frequently asked

Is CVE-2026-26240 being actively exploited?

CVE-2026-26240 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.56%.

How severe is CVE-2026-26240?

CVE-2026-26240 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.56% probability of exploitation.

Which products are affected by CVE-2026-26240?

Affected products include QNAP File Station.

How do I fix CVE-2026-26240?

Upgrade affected software to a fixed version, for example QNAP File Station 5.5.6.5243 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26240 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.