We've released #Netty 4.2.14 and 4.1.134, which are bug-fix releases:

https://netty.io/news/2026/05/20/4-2-14-Final.html
https://netty.io/news/2026/05/20/4-1-134-Final.html

They fix an MQTT parsing regression introduced in the previous release, and a recently introduced CompositeByteBuf bug, among a few others.