Insufficient Entropy in Login Logic of Synology DiskStation Manager
CVE-2026-13639

9.8CRITICAL

Key Information:

Vendor

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

What is CVE-2026-13639?

An insufficient entropy vulnerability in the login logic of Synology DiskStation Manager versions prior to the specified updates permits remote attackers to exploit the issue, potentially leading to unauthorized reading or writing of arbitrary files and availability disruptions through denial-of-service attacks. Users are advised to update their systems to the latest versions to mitigate these risks.

Affected Version(s)

DiskStation Manager (DSM) 7.4

DiskStation Manager (DSM) 7.4 < 7.4-90075

DiskStation Manager (DSM) 7.3.2 < 7.3.2-86009-4

References

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

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Lam Jun Rong (https://jro.sg)
.