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https://issues.apache.org/jira/browse/KAFKA-21020?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18115246#comment-18115246
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Matthias J. Sax commented on KAFKA-21020:
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[~mimaison] – Thoughts on this ticket?
There is also https://issues.apache.org/jira/browse/KAFKA-20815 which reports
the same thing, but the PR did only upgrade to 3.30.15 (and later 3..30.16),
but not 4.2.1 – wondering why?
> Fix CVE-2026-56740: Upgrade jline from 3.30.16 to 4.2.1
> -------------------------------------------------------
>
> Key: KAFKA-21020
> URL: https://issues.apache.org/jira/browse/KAFKA-21020
> Project: Kafka
> Issue Type: Bug
> Reporter: Shubhi Gupta
> Assignee: Harsh Vasava
> Priority: Critical
> Labels: security
>
> A *High-severity vulnerability (CVE-2026-56740)* has been identified in
> {{org.jline:jline-remote-telnet}} versions prior to 4.2.1. The vulnerable jar
> ({{{}jline-3.30.4.jar{}}} / {{{}jline-3.30.16{}}}) is shipped inside the
> Kafka release tarball under {{{}/opt/kafka/libs/{}}}, exposing all Docker
> images built from that tarball to the vulnerability.
> The fix upgrades {{org.jline}} to version *4.2.1* — the first release line in
> which {{jline-remote-telnet}} is patched — and replaces one deprecated API
> call that became a compile-time error under {{{}-Werror{}}}.
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