Improper Neutralization

Overview Affected versions of this package are vulnerable to Improper Neutralization through the CONNECT and PUBLISH encoding paths in MqttEncoder and MqttCodecUtil. An attacker can send MQTT fields containing NUL bytes or wildcard characters by supplying crafted client identifiers, usernames, wi...

EUVD-2026-65093

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

CVE-2026-76816

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.137.Final and 4.2.17.Final, MqttEncoder does not validate client identifiers, will topics, usernames, and PUBLISH topic names before encoding, allowing prohibited null bytes in MQTT UTF-8 string fields and...

PT-2026-81028

Name of the Vulnerable Software and Affected Versions Netty versions prior to 4.1.137.Final Netty versions prior to 4.2.17.Final Description Netty is an asynchronous, event-driven network application framework. The MqttEncoder does not validate client identifiers, will topics, usernames, and...