Main Vulnerability Database Vulnerabilities #VU134941

Stack-based buffer overflow in QNAP Systems, Inc. products - CVE-2026-26240

Published: June 19, 2026

Vulnerability identifier: #VU134941

CSH Severity: High

CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-26240

CWE-ID: CWE-121

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. A remote attacker can trigger stack-based buffer overflow, cause memory corruption and perform a denial of service (DoS) attack.

Affected software

QuTScloud
QuTS hero
QVP (QVR Pro appliances)
QNAP QTS

How to mitigate CVE-2026-26240

Install updates from vendor's website.

QuTScloud - update to
QuTScloud - update to c5.2.9
QuTS hero - update to h5.2.9
QVP (QVR Pro appliances) - update to 2.8.0
QNAP QTS - update to 5.2.10

External References

https://www.qnap.com/en/security-advisory/qsa-26-10

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