CVE-2026-26240: QNAP File Station

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

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

Affected products

• QNAP File Station: from 5.5.6.4691, before 5.5.6.5243 (fixed in 5.5.6.5243)

Published 2026-06-10. Last modified 2026-07-23.