USN-7843-1: Netty vulnerability

Publication date

28 October 2025

Overview

Netty could be made to send emails as your login if it received specially crafted input.


Packages

  • netty - Java NIO client/server socket framework

Details

It was discovered that Netty did not properly handle user input. A remote
attacker could possibly use this issue to forge arbitrary emails from a
trusted server.

It was discovered that Netty did not properly handle user input. A remote
attacker could possibly use this issue to forge arbitrary emails from a
trusted server.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
25.10 questing libnetty-java –  1:4.1.48-10ubuntu0.25.10.1
25.04 plucky libnetty-java –  1:4.1.48-10ubuntu0.25.04.1
24.04 LTS noble libnetty-java –  1:4.1.48-9ubuntu0.1~esm2  
22.04 LTS jammy libnetty-java –  1:4.1.48-4+deb11u2ubuntu0.1~esm2  
20.04 LTS focal libnetty-java –  1:4.1.45-1ubuntu0.1~esm3  
18.04 LTS bionic libnetty-java –  1:4.1.7-4ubuntu0.1+esm4  

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

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