CVEvulnerability

CVE-2026-76816

3.5 LOW Published 2026-08-24 Modified 2026-10-12 Official page ↗
Status
Deferred
Published
2026-08-24
Last modified
2026-10-12
Assigner
[email protected]
CVSS 3.1 ([email protected])
3.5 LOW — CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-20, CWE-626

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.

Related

Weakness · CWE (2)

  • CWE-20 Improper Input Validation weakness
  • CWE-626 Null Byte Interaction Error (Poison Null Byte) weakness

References