A thunderbird security has been released for Debian GNU/Linux 10 to address multiple security issues which could result in denial of service or potentially the execution of arbitrary code.

DSA 4740-1: thunderbird security update

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Debian Security Advisory DSA-4740-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
August 02, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-6463 CVE-2020-6514 CVE-2020-15652 CVE-2020-15659

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

For the stable distribution (buster), these problems have been fixed in
version 1:68.11.0-1~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/