The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: libunbound8 1.9.0-2ubuntu0.1 unbound 1.9.0-2ubuntu0.1 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-4149-1
CVE-2019-16866
https://launchpad.net/ubuntu/+source/unbound/1.9.0-2ubuntu0.1
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