The problem can be corrected by updating your system to the following package versions: Ubuntu 19.04: irssi 1.2.0-2ubuntu1.2 After a standard system update you need to restart Irssi to make all the necessary changes.
https://ubuntu.com/security/notices/USN-4119-1
CVE-2019-15717
https://launchpad.net/ubuntu/+source/irssi/1.2.0-2ubuntu1.2
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