A thunderbird security update has been released for both Debian GNU/Linux 9 and 10

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Debian Security Advisory DSA-4585-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
December 15, 2019 https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2019-17005 CVE-2019-17008 CVE-2019-17010
CVE-2019-17011 CVE-2019-17012
Debian Bug : 946588

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

For the oldstable distribution (stretch), these problems have been fixed
in version 1:68.3.0-2~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1:68.3.0-2~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/