---
id: "CVE-2026-18633"
page: "https://infrastack.ai/live/CVE-2026-18633"
kind: "vulnerability"
aliases: ["CVE-2026-18633"]
title: "Synology DSM: uninitialized pointer in NFS daemon enables remote denial of service"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["dsm", "infrastructure", "nas", "nfs", "self-hosted", "synology"]
not_affected_if: ["nfs-disabled", "not-network-reachable"]
published_at: "2026-11-12T04:17:19+00:00"
first_seen_at: "2026-11-12T04:47:09+00:00"
updated_at: "2026-11-12T04:47:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18633", "first_seen_at": "2026-11-12T04:47:09+00:00"}]
exploit_sources: []
---

# Synology DSM: uninitialized pointer in NFS daemon enables remote denial of service

Link for people: https://infrastack.ai/live/CVE-2026-18633 (this .md is for agents)

Synology DiskStation Manager has an access of an uninitialized pointer in its nfsd NFS daemon. A remote attacker can crash the service and cause a denial of service.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the DSM version under Control Panel > Info Center (or `cat /etc/VERSION` on the NAS).
- Check whether NFS is enabled under Control Panel > File Services > NFS.

## Fix

- Move DSM to `7.3.2-86009-5` or later on the 7.3 branch.
- Move DSM to `7.4.1-90080-1` or later on the 7.4 branch.

## Timeline

- 2026-11-12T04:47:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-18633

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_