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

DSA 5074-1: thunderbird security update

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Debian Security Advisory DSA-5074-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 13, 2022   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2022-22754 CVE-2022-22756 CVE-2022-22759 CVE-2022-22760
CVE-2022-22761 CVE-2022-22763 CVE-2022-22764

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 1:91.6.0-1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 1:91.6.0-1~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/