An irssi security update has been released for Debian GNU/Linux 9 LTS to fix a user-after-free vulnerability.

DLA 3025-1: irssi security update

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Debian LTS Advisory DLA-3025-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
May 26, 2022   https://wiki.debian.org/LTS
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Package : irssi
Version : 1.0.7-1~deb9u2
Debian Bug : #931264

It was discovered that there was a user-after-free vulnerability in
irssi, the popular terminal-based IRC client.

For Debian 9 "Stretch", this problem has been fixed in version
1.0.7-1~deb9u2.

We recommend that you upgrade your irssi packages.

For the detailed security status of irssi please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/irssi

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS