---
id: "CVE-2026-85080"
kind: "vulnerability"
aliases: ["CVE-2026-85080"]
title: "EmberZNet: malformed GetGroupMembership message crashes Zigbee device stack"
severity: "medium"
cvss: 6.0
epss: 0.00354
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["embedded", "infrastructure", "silicon-labs-emberznet", "zigbee"]
not_affected_if: ["network-without-untrusted-devices", "no-group-cluster"]
published_at: "2026-10-22T14:17:51+00:00"
first_seen_at: "2026-10-23T21:57:31+00:00"
updated_at: "2026-10-25T04:05:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85080", "first_seen_at": "2026-10-23T21:57:31+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-85080", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# EmberZNet: malformed GetGroupMembership message crashes Zigbee device stack

EmberZNet 9.1.1 and earlier mishandle a malformed GetGroupMembership message, causing an out-of-bounds write that crashes the device. The sources say only a limited set of values can be written and no remote code execution route was observed.

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

## How to check

- Check the EmberZNet SDK version on the device firmware, unknown if the sources give a command
- Check whether the device supports the Group Cluster, per the sources only those devices are impacted

## Fix

- Move EmberZNet to a release newer than `9.1.1`, unknown exact fixed version in the sources

## Timeline

- 2026-10-23T21:57:31+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-85080
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-85080

## From the sources

In EmberZNet 9.1.1 and earlier, a malformed GetGroupMembership message can result in an out-of-bounds write leading to a crash. A limited number of values can be written using this vulnerability, so no route to remote code execution was observed. These messages must come from a device that has already joined the network. Only devices supporting the Group Cluster are impacted.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_