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PatchSiren cyber security CVE debrief

CVE-2026-26240 Qnap CVE debrief

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. The vulnerability has already been fixed in File Station 5 version 5.5.6.5243 and later.

Vendor
Qnap
Product
File Station
CVSS
LOW 1.3
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 using versions prior to 5.5.6.5243.

Technical summary

The vulnerability, tracked as CVE-2026-26240, is a buffer overflow issue in File Station 5, a file management application provided by QNAP. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 5.3, indicating a medium severity level. The vulnerability allows remote attackers to exploit the buffer overflow, potentially leading to memory modification or process crashes.

Defensive priority

Medium

Recommended defensive actions

  • Update File Station 5 to version 5.5.6.5243 or later.
  • Restrict access to File Station 5 to trusted networks and users.
  • Monitor File Station 5 logs for suspicious activity.

Evidence notes

The vulnerability has been analyzed and verified by official sources, including the National Vulnerability Database (NVD).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-26240 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-26240

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

  • CVE-2026-26240 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-26240

    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.