Cyber Resilience

CVE-2026-26240

LowUpdated

Published: 10 June 2026

Published
10 June 2026
Modified
17 June 2026
KEV Added
—
Patch
—
CVSS Score v4 1.3 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0032 23.6th percentile
Risk Priority 15 floored blend · peak EPSS

Summary

CVE-2026-26240 is a low-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Qnap File Station. Its CVSS base score is 1.3 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 23.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

and later

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Buffer overflow in public-facing File Station enables remote exploitation (T1190), memory modification for privilege escalation (T1068), and process crashes for DoS (T1499.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

Affected Assets

qnap
file station
5.5.6.4691 — 5.5.6.5243

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References