CVE-2026-26239

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. 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 the following version: File Station 5 5.5.6.5208 and later

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-26239

EUVD

EUVD-2026-35979

Affected Vendors & Products

Vendor	Product	Version / Range
qnap	file_station	From 5.5.6.4691 (inc) to 5.5.6.5208 (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. It allows a remote attacker who has obtained a user account to exploit the vulnerability to modify memory or cause processes to crash.

Impact Analysis

If exploited, this vulnerability can allow an attacker to modify memory or crash processes on the affected system. This could lead to system instability, denial of service, or potentially unauthorized actions depending on the attacker's goals.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade File Station 5 to version 5.5.6.5208 or later, where the vulnerability has been fixed.

Hi! I’m here to help you understand CVE-2026-26239. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70