A thunderbird security update has been released for both Debian GNU/Linux 9 and 10 to address multiple security issues which could potentially result in the execution of arbitrary code or information disclosure.

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Debian Security Advisory DSA-4603-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 17, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2019-17016 CVE-2019-17017 CVE-2019-17022
CVE-2019-17024 CVE-2019-17026

Multiple security issues have been found in Thunderbird which could
potentially result in the execution of arbitrary code or information
disclosure.

For the oldstable distribution (stretch), these problems have been fixed
in version 1:68.4.1-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1:68.4.1-1~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/