A thunderbird security update has been released for Debian GNU/Linux 10 and 11 to address multiple security issues.

DSA 5045-1: thunderbird security update

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Debian Security Advisory DSA-5045-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 14, 2022   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2021-4140 CVE-2022-22737 CVE-2022-22738 CVE-2022-22739
CVE-2022-22740 CVE-2022-22741 CVE-2022-22742 CVE-2022-22743
CVE-2022-22745 CVE-2022-22747 CVE-2022-22748 CVE-2022-22751

Multiple security issues were discovered in Thunderbird, which could
result in denial of service or the execution of arbitrary code.

For the oldstable distribution (buster), these problems have been fixed
in version 1:91.5.0-2~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 1:91.5.0-2~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/