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

DSA 4796-1: thunderbird security update

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Debian Security Advisory DSA-4796-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
November 21, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-16012 CVE-2020-26951 CVE-2020-26953 CVE-2020-26956
CVE-2020-26958 CVE-2020-26959 CVE-2020-26960 CVE-2020-26961
CVE-2020-26965 CVE-2020-26968

Multiple security issues have been found in Thunderbird, which may lead
to the execution of arbitrary code or denial of service.

For the stable distribution (buster), these problems have been fixed in
version 1:78.5.0-1~deb10u1.

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/