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[USN-7843-1] Netty vulnerability

Posted on 30 October 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7843-1
October 28, 2025

netty vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

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

Software Description:
- 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.

Update instructions:

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

Ubuntu 25.10
libnetty-java 1:4.1.48-10ubuntu0.25.10.1

Ubuntu 25.04
libnetty-java 1:4.1.48-10ubuntu0.25.04.1

Ubuntu 24.04 LTS
libnetty-java 1:4.1.48-9ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 22.04 LTS
libnetty-java 1:4.1.48-4+deb11u2ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 20.04 LTS
libnetty-java 1:4.1.45-1ubuntu0.1~esm3
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libnetty-java 1:4.1.7-4ubuntu0.1+esm4
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-7843-1
CVE-2025-59419

Package Information:
https://launchpad.net/ubuntu/+source/netty/1:4.1.48-10ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/netty/1:4.1.48-10ubuntu0.25.04.1

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