# CVE-2026-85080: Silicon Labs EmberZNet out-of-bounds write in Group Cluster

Source: https://junglewise.ai/threats/cve-2026-85080-in-emberznet-9-1-1-and-earlier-a-malformed-getgroupmembership  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-22. Updated: 2026-10-22  
License: CC BY 4.0 with a link back

CVE-2026-85080 · Severity: info · Published 2026-10-22

EmberZNet is Silicon Labs' Zigbee SDK used in IoT and smart home devices. A malformed message to the Group Cluster can cause a crash, disrupting device operation. The vulnerability requires an attacker to be already connected to the Zigbee network, limiting the attack scope to insider or local threats.

Technologies: [Silicon Labs EmberZNet](https://junglewise.ai/threats/technologies/emberznet). Vendors: [Silicon Labs](https://junglewise.ai/threats/vendors/silicon-labs).

## Quick answers

**Is CVE-2026-85080 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-85080 being exploited in the wild.

**How severe is CVE-2026-85080?** Informational severity, published 22 October 2026.

**Which products and versions are affected?** Silicon Labs EmberZNet 9.1.1 and earlier.

**Is there a fix for CVE-2026-85080?** Yes: fixed in SiSDK 2026.6.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-85080 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-85080?** Check whether you run Silicon Labs EmberZNet 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 SiSDK 2026.6.2 or later

## Technical details

An out-of-bounds write vulnerability exists in the GetGroupMembership message handler of the Group Cluster in EmberZNet 9.1.1 and earlier. The vulnerability requires an authenticated attacker on the Zigbee network to send a crafted message; the limited scope of values that can be written prevents remote code execution but enables denial-of-service through device crash. Watchdog mechanisms can detect and recover from these attacks.

## Affected products

- Silicon Labs EmberZNet 9.1.1 and earlier

## Timeline

- 2026-10-22: disclosed

## References

- [https://github.com/SiliconLabsSoftware/docs-security-advisories/blob/main/Advisories/500-599/A-00000590.md](https://github.com/SiliconLabsSoftware/docs-security-advisories/blob/main/Advisories/500-599/A-00000590.md)

## Related threats

- [Silicon Labs EmberZNet out-of-bounds write in Price cluster](https://junglewise.ai/threats/cve-2026-94502-in-emberznet-9-1-1-and-earlier-a-malformed-publish-price-matrix)
- [Silicon Labs EmberZNet out-of-bounds write in Simple_Desc_req](https://junglewise.ai/threats/cve-2026-85079-in-emberznet-9-1-1-and-earlier-a-malformed-simple-desc-req)
- [Silicon Labs EmberZNet denial-of-service in Price Cluster](https://junglewise.ai/threats/cve-2026-66282-in-emberznet-9-1-1-and-earlier-a-malformed-publish-billing-period)
- [Silicon Labs EmberZNet denial-of-service in Discover Attributes](https://junglewise.ai/threats/cve-2026-66281-in-emberznet-9-1-1-and-earlier-a-malformed-discover-attributes)
- [Silicon Labs EmberZNet out-of-bounds read in ZCL parsing logic](https://junglewise.ai/threats/cve-2026-4526-silicon-labs-emberznet-out-of-bounds-read-in-zcl-parsing-logic)