---
id: CVE-2026-89409
title: Unvalidated ZWAVE_CMD_NODES_EXIST May Cause Deletion of End Nodes​
summary: >-
  In Z-Wave SDK 8.1.1 and earlier (for 700/800 series devices) and 6.85.02 and
  earlier (for 500 series devices), missing checks in the ZWAVE_CMD_NODES_EXIST
  handler can result in nodes being removed from the network. These messages
  must co…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-940
vendor: Silicon Labs
product: Z-Wave SDK
affected:
  - z-wave_sdk >= 7.0.0 <= 8.1.1
  - z-wave_sdk <= 6.85.02
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-22T18:26:12.932750Z'
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T19:00:32.048Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89409'
references:
  - url: >-
      https://github.com/SiliconLabsSoftware/docs-security-advisories/blob/main/Advisories/500-599/A-00000591.md
tags:
  - cve.org
ingestedAt: '2026-10-22T22:00:50.374Z'
---

## Overview

In Z-Wave SDK 8.1.1 and earlier (for 700/800 series devices) and 6.85.02 and earlier (for 500 series devices), missing checks in the ZWAVE_CMD_NODES_EXIST handler can result in nodes being removed from the network. These messages must come from a device that has already joined the network.

## Affected

- `z-wave_sdk >= 7.0.0 <= 8.1.1`
- `z-wave_sdk <= 6.85.02`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.