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[USN-8742-1] Netty vulnerability

Posted on 10 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8742-1
September 10, 2026

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

- Ubuntu 24.04 LTS

Summary:

Netty could be exposed to cache poisoning.

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

Details:

It was discovered that Netty incorrectly validates the bailiwick of NS
records. An attacker could possibly use this issue to facilitate DNS
cache poisoning attacks.

Update instructions:

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

Ubuntu 24.04 LTS
libnetty-java 1:4.1.48-9ubuntu0.2+esm2
Available with Ubuntu Pro



References:
https://ubuntu.com/security/notices/USN-8742-1
CVE-2026-47691

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