CVE-2026-85098: Synology DiskStation Manager reachable assertion denial-of-service

CVE-2026-85098 · Severity: medium · CVSS 5.3 · Published 2026-11-12

Synology DiskStation Manager (DSM) is a network-attached storage operating system that manages file storage and sharing. A defect in the synoscgi component allows remote attackers to cause denial-of-service attacks by triggering a reachable assertion, potentially disrupting access to stored data and services.

Technologies: Synology DiskStation Manager. Vendors: Synology.

Quick answers

Is CVE-2026-85098 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-85098 being exploited in the wild.
How severe is CVE-2026-85098?
Medium severity, with a CVSS score of 5.3, published 12 November 2026.
Which products and versions are affected?
Synology DiskStation Manager before 7.3.2-86009-5 and before 7.4.1-90080-1.
Is there a fix for CVE-2026-85098?
Yes: fixed in DSM 7.3.2-86009-5, 7.4.1-90080-1 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-85098 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-85098?
Check whether you run Synology DiskStation Manager at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: DSM 7.3.2-86009-5, 7.4.1-90080-1 or above

Technical details

A reachable assertion vulnerability exists in the synoscgi component of DSM, allowing remote attackers to conduct denial-of-service attacks without authentication. The flaw is triggered through a network-based attack vector that causes an assertion failure, leading to service interruption. Patches are available in DSM 7.3.2-86009-5 and 7.4.1-90080-1 or later.

Affected products

  • Synology DiskStation Manager before 7.3.2-86009-5 and before 7.4.1-90080-1

Timeline

  • 2026-11-12: disclosed
  • 2026-11-10: advisory

References

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