PJ Fanning created HADOOP-20070:
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             Summary: upgrade to netty 4.2.20
                 Key: HADOOP-20070
                 URL: https://issues.apache.org/jira/browse/HADOOP-20070
             Project: Hadoop Common
          Issue Type: Task
            Reporter: PJ Fanning


https://netty.io/news/2026/11/02/4-2-20-Final.html includes a large number of 
CVE fixes.

So far, Hadoop has stuck with Netty 4.1.x but that is EOL since the middle of 
2026.
Upgrading from 4.1 has been straightforward where I've done this before (eg 
Apache Pekko).



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