CVE-2026-102762: High severity Microsoft NetX Duo vulnerability
Published Sep 29, 2026
·Updated
The NetX Duo MQTT client leaks the packet carrying a malformed PUBLISH message. Each malformed PUBLISH costs one packet, or one chain of packets, from the network driver's receive pool, and nothing returns it. A peer that can deliver a few dozen such messages exhausts the pool and stops all inbound network traffic on the device until it is rebooted.
Affected Software
1 affected component
Microsoft NetX Duo
Event History
Sep 29, 2026
CVE Published
via MITRE·05:32 PM
Data Sourced
via MITRE·05:32 PM
DescriptionWeakness
Data Sourced
via NVD·06:17 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What does an attacker need to exploit this issue?
The attacker needs to be a peer that can deliver malformed MQTT PUBLISH messages to the NetX Duo MQTT client.
2
How many malicious messages are needed to cause an outage?
Each malformed PUBLISH consumes one receive-pool packet or an entire packet chain without returning it. A few dozen such messages can exhaust the network driver's receive pool.
3
What is the operational effect once the receive pool is exhausted?
The device stops accepting all inbound network traffic. Service is not restored until the device is rebooted.