CVE-2026-21888 MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()

NanoMQ MQTT Broker NanoMQ is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: getvarinteger accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier...

EUVD-2025-199658

NanoMQ MQTT Broker NanoMQ is an all-around Edge Messaging Platform. Prior to version 0.22.5, a Heap-Use-After-Free UAF vulnerability exists in the TCP transport component of NanoMQ, which relies on the underlying NanoNNG library specifically in src/sp/transport/mqtt/brokertcp.c. The vulnerability...

OESA-2022-1498 mosquitto security update

Mosquitto is an open source message broker that implements the MQ Telemetry Transport protocol version 3.1 and 3.1.1 MQTT provides a lightweight method of carrying out messaging using a publish/subscribe model. This makes it suitable for "machine to machine" messaging such as with low power senso...

UBUNTU-CVE-2021-34431

In Eclipse Mosquitto version 1.6 to 2.0.10, if an authenticated client that had connected with MQTT v5 sent a crafted CONNECT message to the broker a memory leak would occur, which could be used to provide a DoS attack against the broker...