CVE-2026-40531 in DiskStation Manager

Summary

by MITRE • 09/18/2026

An integer overflow or wraparound vulnerability in File Operation in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote authenticated users to conduct limited denial-of-service attacks.

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• Responsible: Synology
• Reservation: 04/14/2026
• Disclosure: 09/18/2026
• Moderation: accepted
• Entry: VDB-407432
• CPE: ready
• CWE: CWE-190 (confirmed)
• CVSS: 4.3 (CNA)
• EPSS: 0.00000
• KEV: no
• Activities: very low
• Sector: Government, Insurance, ...

Sources

• MITRE: https://www.cve.org/CVERecord?id=CVE-2026-40531
• NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40531
• CVE Details: https://www.cvedetails.com/cve/CVE-2026-40531/