CVE-2026-26240

Analyzed Analyzed - Analysis Complete

Buffer Overflow in QNAP File Station

Publication date: 2026-06-10

Last updated on: 2026-06-12

Assigner: QNAP Systems, Inc.

Description

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

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-10

Last Modified

2026-06-12

Generated

2026-06-30

AI Q&A

2026-06-10

EPSS Evaluated

2026-06-29

NVD

CVE-2026-26240

EUVD

EUVD-2026-35983

Affected Vendors & Products

Vendor	Product	Version / Range
qnap	file_station	From 5.5.6.4691 (inc) to 5.5.6.5243 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This vulnerability is a buffer overflow issue affecting File Station 5. Remote attackers can exploit this flaw to modify memory or cause processes to crash.

Impact Analysis

The impact of this vulnerability includes the potential for remote attackers to alter memory contents or crash processes, which could lead to system instability or unauthorized behavior.

Mitigation Strategies

To mitigate this vulnerability, you should update File Station 5 to version 5.5.6.5243 or later, where the buffer overflow issue has been fixed.

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