CVE-2026-76816 | BDVDB-2026-364014 Detail

Description#

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 potentially causing routing, access-control, or identity mismatches in downstream brokers. The vulnerability is exploitable when an application uses Netty's MQTT encoder to construct messages from user-controlled input. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Impact#

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Exploit#

History#

1. Version 12026-08-24Record published in the CVE List.
2. Version 22026-08-25Most recent update recorded in the CVE List.