==========================================================================
Ubuntu Security Notice USN-7918-1
December 09, 2025

netty vulnerabilities
==========================================================================

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
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Netty.

Software Description:
- netty: event-driven asynchronous network application framework

Details:

Jeppe Bonde Weikop discovered that Netty incorrectly parsed HTTP
messages. When Netty is used with certain reverse proxies, a
remote attacker could possibly use this issue to perform HTTP request
smuggling attacks. (CVE-2025-58056)

Jonas Konrad discovered that Netty did not properly manage memory when
decoding compressed data. A remote attacker could possibly use this
issue to cause Netty to consume excessive memory, resulting in a denial
of service. This issue was only addressed in Ubuntu 18.04 LTS, Ubuntu
20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.04, and
Ubuntu 25.10. (CVE-2025-58057)

Update instructions:

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

Ubuntu 25.10
  libnetty-java                   1:4.1.48-10ubuntu0.25.10.2

Ubuntu 25.04
  libnetty-java                   1:4.1.48-10ubuntu0.25.04.2

Ubuntu 24.04 LTS
  libnetty-java                   1:4.1.48-9ubuntu0.1

Ubuntu 22.04 LTS
  libnetty-java                   1:4.1.48-4+deb11u2ubuntu0.1

Ubuntu 20.04 LTS
  libnetty-java                   1:4.1.45-1ubuntu0.1~esm4
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libnetty-java                   1:4.1.7-4ubuntu0.1+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libnetty-java                   1:4.0.34-1ubuntu0.1~esm3
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7918-1
  CVE-2025-58056, CVE-2025-58057

Package Information:
  https://launchpad.net/ubuntu/+source/netty/1:4.1.48-10ubuntu0.25.10.2
  https://launchpad.net/ubuntu/+source/netty/1:4.1.48-10ubuntu0.25.04.2
  
  https://launchpad.net/ubuntu/+source/netty/1:4.1.48-4+deb11u2ubuntu0.1