CVE-2026-26240: CWE-121 in QNAP Systems Inc. File Station 5
A buffer overflow vulnerability (CWE-121) exists in QNAP Systems Inc. File Station 5, allowing remote attackers to modify memory or crash processes. The vulnerability affects version 5. 5. 0 and was fixed in version 5. 5. 6. 5243 and later. The CVSS 4. 0 base score is 5.
AI Analysis
Technical Summary
CVE-2026-26240 is a buffer overflow vulnerability in QNAP File Station 5 that can be exploited remotely without privileges or user interaction. Successful exploitation may allow attackers to modify memory or cause process crashes. The vulnerability affects version 5.5.0 and was addressed in version 5.5.6.5243 and later.
Potential Impact
Exploitation of this vulnerability can lead to unauthorized memory modification or denial of service through process crashes. The CVSS score of 5.3 reflects a medium severity impact with network attack vector, low attack complexity, no privileges required, and limited integrity and availability impact.
Mitigation Recommendations
Upgrade File Station 5 to version 5.5.6.5243 or later, where this vulnerability has been fixed. No other specific mitigations are indicated.
CVE-2026-26240: CWE-121 in QNAP Systems Inc. File Station 5
Description
A buffer overflow vulnerability (CWE-121) exists in QNAP Systems Inc. File Station 5, allowing remote attackers to modify memory or crash processes. The vulnerability affects version 5. 5. 0 and was fixed in version 5. 5. 6. 5243 and later. The CVSS 4. 0 base score is 5.
CVSS v4.0
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-26240 is a buffer overflow vulnerability in QNAP File Station 5 that can be exploited remotely without privileges or user interaction. Successful exploitation may allow attackers to modify memory or cause process crashes. The vulnerability affects version 5.5.0 and was addressed in version 5.5.6.5243 and later.
Potential Impact
Exploitation of this vulnerability can lead to unauthorized memory modification or denial of service through process crashes. The CVSS score of 5.3 reflects a medium severity impact with network attack vector, low attack complexity, no privileges required, and limited integrity and availability impact.
Mitigation Recommendations
Upgrade File Station 5 to version 5.5.6.5243 or later, where this vulnerability has been fixed. No other specific mitigations 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: 6a28f1e98dd33fbd85e94441
Added to database: 6/10/2026, 5:11:05 AM
Last enriched: 6/10/2026, 5:31:04 AM
Last updated: 6/10/2026, 7:21:39 AM
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.