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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
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-10
Original CVE updated
2026-06-12
Advisory published
2026-06-10
Advisory updated
2026-06-12

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).

Official resources

CVE-2026-26240 was published on 2026-06-10T05:16:38.987Z and modified on 2026-06-12T12:52:58.360Z.