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https://issues.apache.org/jira/browse/TINKERPOP-1375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15382098#comment-15382098
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Robert Dale commented on TINKERPOP-1375:
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Recommend updating to latest Netty 4.0.39.Final.  Tinkerpop is at 4.0.34.

4.0.37 fixes a "leak" and other memory issues.  It also addresses security 
issue "CVE-2016-4970 and can lead to a DOS"

Release Notes:
http://netty.io/news/2016/03/21/4-0-35-Final.html
http://netty.io/news/2016/04/04/4-0-36-Final.html
http://netty.io/news/2016/06/07/4-0-37-Final.html
http://netty.io/news/2016/07/01/4-0-38-Final-4-1-2-Final.html
http://netty.io/news/2016/07/15/4-0-39-Final-4-1-3-Final.html

> Possible ByteBuf leak for certain transactional scenarios
> ---------------------------------------------------------
>
>                 Key: TINKERPOP-1375
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1375
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.2.0-incubating
>            Reporter: stephen mallette
>            Assignee: stephen mallette
>
> Not sure how to recreate this but certain transactional scenarios in sessions 
> seem to generate a standard Netty "LEAK" log message. 



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