This is a security and new features release for the Bind DNS server. The security one is a potential DoS attack:
More information on it here: https://kb.isc.org/docs/cve-2019-6471
Full release notes here: https://downloads.isc.org/isc/bind9/9.14.6/RELEASE-NOTES-bind-9.14.6.html
A race condition could trigger an assertion failure when a large number of incoming packets were
being rejected. This flaw is disclosed in CVE-2019-6471
More information on it here: https://kb.isc.org/docs/cve-2019-6471
Full release notes here: https://downloads.isc.org/isc/bind9/9.14.6/RELEASE-NOTES-bind-9.14.6.html
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