A thunderbird security update has been released for Debian GNU/Linux 10 to address multiple security issues, which may lead to the execution of arbitrary code, denial of service or information leak.

DSA 4815-1: thunderbird security update

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Debian Security Advisory DSA-4815-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 17, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-16042 CVE-2020-26971 CVE-2020-26973 CVE-2020-26974
CVE-2020-26978 CVE-2020-35111 CVE-2020-35113

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

For the stable distribution (buster), these problems have been fixed in
version 1:78.6.0-1~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/