A caribou regression update has been released for Debian GNU/Linux 9 LTS to address a regression introduced by the previous DLA-2486-1 update.

DLA 2675-1: caribou regression update

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Debian LTS Advisory DLA-2675-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
June 03, 2021   https://wiki.debian.org/LTS
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Package : caribou
Version : 0.4.21-1+deb9u1
Debian Bug : 980061

It was found that the fix for CVE-2020-25712 in the Xorg X server, addressed
in DLA-2486-1, caused a regression in caribou, making it crash whenever
special (shifted) characters were entered.

For Debian 9 stretch, this problem has been fixed in version
0.4.21-1+deb9u1.

We recommend that you upgrade your caribou packages.

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

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