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PatchSiren cyber security CVE debrief

CVE-2026-26239 Qnap CVE debrief

A buffer overflow vulnerability has been reported to affect File Station 5. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes.

Vendor
Qnap
Product
File Station
CVSS
MEDIUM 6.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-17
Advisory published
2026-06-10
Advisory updated
2026-06-17

Who should care

Administrators and users of QNAP File Station 5, especially those with remote access or user accounts.

Technical summary

The vulnerability is a buffer overflow issue in File Station 5, which can be exploited by a remote attacker with a user account to modify memory or crash processes. The CVSS score for this vulnerability is 8.7, indicating a high severity.

Defensive priority

High

Recommended defensive actions

  • Update File Station 5 to version 5.5.6.5208 or later.

Evidence notes

The vulnerability has been fixed in File Station 5 version 5.5.6.5208 and later.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26239 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26239

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-26239 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26239

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.