A thunderbird security update has been released for Debian GNU/Linux 10 and 11 to address an out-of-bounds write.

DSA 5086-1: thunderbird security update

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Debian Security Advisory DSA-5086-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 23, 2022   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2022-0566

An out-of-bounds write was discovered in Thunderbird, which could
be triggered via a malformed email message.

For the oldstable distribution (buster), this problem has been fixed
in version 1:91.6.1-1~deb10u1.

For the stable distribution (bullseye), this problem has been fixed in
version 1:91.6.1-1~deb11u1.

We recommend that you upgrade your thunderbird packages.

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

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