Integer Overflow Vulnerability in Synology DiskStation Manager
CVE-2026-40531

4.3MEDIUM

Key Information:

Vendor

Synology
Status
Diskstation Manager (dsm)
Vendor
CVE Published:
18 September 2026

What is CVE-2026-40531?

A vulnerability exists in Synology DiskStation Manager (DSM) that allows for an integer overflow or wraparound during file operations. This flaw impacts remote authenticated users who may exploit it to perform limited denial-of-service attacks, potentially causing disruption to service and affecting system availability. Users are recommended to upgrade to secure versions of DSM to mitigate these risks.

Affected Version(s)

DiskStation Manager (DSM) 7.3

DiskStation Manager (DSM) 7.3 < 7.3.2-86009-2

DiskStation Manager (DSM) 7.2.2 < 7.2.2-72806-7

References

https://www.synology.com/en-global/security/advisory/Syno...
vendor-advisory

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Pumpkin (@u1f383) from DEVCORE Research Team
.