Bug 2523094 (CVE-2026-76816) - CVE-2026-76816 io.netty/netty-codec-mqtt: Netty: MQTT validation bypass leading to message integrity issues
Summary: CVE-2026-76816 io.netty/netty-codec-mqtt: Netty: MQTT validation bypass leadi...
Keywords:
Status: NEW
Alias: CVE-2026-76816
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-24 20:01 UTC by OSIDB Bzimport
Modified: 2026-09-23 21:21 UTC (History)
48 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-24 20:01:38 UTC 
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.
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