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

DSA 5106-1: thunderbird security update

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Debian Security Advisory DSA-5106-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 21, 2022   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2022-26381 CVE-2022-26383 CVE-2022-26384 CVE-2022-26386
CVE-2022-26387

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

For the oldstable distribution (buster), these problems have been fixed
in version 1:91.7.0-2~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 1:91.7.0-2~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/