CVE-2026-26239: CWE-121 in QNAP Systems Inc. File Station 5
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
AI Analysis
Technical Summary
This vulnerability (CWE-121) in File Station 5 allows a remote attacker who has obtained a user account to trigger a buffer overflow, potentially modifying memory or crashing processes. The issue affects version 5.5.0 and was addressed in version 5.5.6.5208. The CVSS 4.0 base score is 6.3, indicating a medium severity with network attack vector, low attack complexity, no user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to unauthorized memory modification or denial of service via process crashes. This could disrupt normal operation of File Station 5 and potentially allow further compromise depending on the attacker's privileges.
Mitigation Recommendations
Upgrade File Station 5 to version 5.5.6.5208 or later, where this vulnerability has been fixed. No other remediation or temporary fixes are indicated.
CVE-2026-26239: CWE-121 in QNAP Systems Inc. File Station 5
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 v4.0
Score 6.3medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-121) in File Station 5 allows a remote attacker who has obtained a user account to trigger a buffer overflow, potentially modifying memory or crashing processes. The issue affects version 5.5.0 and was addressed in version 5.5.6.5208. The CVSS 4.0 base score is 6.3, indicating a medium severity with network attack vector, low attack complexity, no user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to unauthorized memory modification or denial of service via process crashes. This could disrupt normal operation of File Station 5 and potentially allow further compromise depending on the attacker's privileges.
Mitigation Recommendations
Upgrade File Station 5 to version 5.5.6.5208 or later, where this vulnerability has been fixed. No other remediation or temporary fixes are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- qnap
- Date Reserved
- 2026-02-12T02:21:35.483Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a28dcc68dd33fbd85dbad78
Added to database: 06/10/2026, 03:40:54 UTC
Last enriched: 06/17/2026, 07:38:37 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 79
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