What is CVE-2026-26239?

CVE-2026-26239 is a high-severity vulnerability in Qnap File_station, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-06-10.

How severe is CVE-2026-26239?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Qnap File_station

CVE-2026-26239

A buffer overflow vulnerability has been reported to affect File Station 5. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. We have already fixed the vulnerability in…

Vulnerability class: Buffer Overflow

EPSS: 0.004 (34.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Qnap File_station
Qnap Systems Inc. File Station 5 — versions 5.5.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

security@qnapsecurity.com.tw (Broken Link)
security@qnapsecurity.com.tw

Frequently asked questions

What is CVE-2026-26239?: CVE-2026-26239 is a high-severity vulnerability in Qnap File_station, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-06-10.
How severe is CVE-2026-26239?: High severity. CVSS v3 base score is 8.1 out of 10.