Stack-based buffer overflow in QNAP Systems, Inc. products - CVE-2026-26239
Published: June 19, 2026
Vulnerability identifier: #VU134940
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-26239
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: QNAP Systems, Inc.
Affected software:
QuTScloud
QuTS hero
QVP (QVR Pro appliances)
QNAP QTS
QuTScloud
QuTS hero
QVP (QVR Pro appliances)
QNAP QTS
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error. A remote user can trigger stack-based buffer overflow, cause memory corruption and perform a denial of service (DoS) attack.
How to mitigate CVE-2026-26239
Install updates from vendor's website.