Quick answers
- Is CVE-2026-18633 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-18633 being exploited in the wild.
- How severe is CVE-2026-18633?
- High severity, with a CVSS score of 7.5, published 12 November 2026.
- Which products and versions are affected?
- Synology DiskStation Manager (DSM) 7.3.x before 7.3.2-86009-5, 7.4.x before 7.4.1-90080-1.
- Is there a fix for CVE-2026-18633?
- 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-2026-18633 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-18633?
- Check whether you run Synology DiskStation Manager (DSM) 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
An uninitialized pointer dereference vulnerability (CWE-824) in the nfsd component allows remote, unauthenticated attackers to trigger a denial-of-service condition via malformed NFS requests. The vulnerability requires only network access with no authentication or user interaction. A successful exploit crashes the NFS service, disrupting file access.
Affected products
- Synology DiskStation Manager (DSM) 7.3.x before 7.3.2-86009-5, 7.4.x before 7.4.1-90080-1
Timeline
- 2026-11-10: disclosed
- 2026-11-10: advisory