Vulnerability record
CVE-2026-18633
The short answer
CVE-2026-18633 affects Synology DiskStation Manager (DSM) and is rated high (CVSS 7.5). It is not in CISA's Known Exploited Vulnerabilities catalog.
What it is
An access of uninitialized pointer vulnerability in the nfsd in Synology DiskStation Manager (DSM) before 7.3.2-86009-5 and 7.4.1-90080-1 allows remote attackers to conduct denial-of-service attacks.
Weakness: CWE-824.
Severity
7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
No score
FIRST scores CVEs within a day of publication
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Affected products
DiskStation Manager (DSM). NVD's record lists the exact affected versions.
References
Questions
Is CVE-2026-18633 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-12.
How do I fix CVE-2026-18633?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Received. The description is NVD's text, quoted as published.
Related
Know the day a CVE lands in your code
Connect a GitHub repository and ZeusQA checks its dependencies daily, briefs each advisory and opens the fix. Three test runs free, no card.