A thunderbird security update has been released for Debian GNU/Linux 10 to address a stack overflow in SMTP server status handling which could potentially result in the execution of arbitrary code.

DSA 4802-1: thunderbird security update

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Debian Security Advisory DSA-4802-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 03, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-26970

Chiaki Ishikawa discovered a stack overflow in SMTP server status
handling which could potentially result in the execution of arbitrary
code.

For the stable distribution (buster), this problem has been fixed in
version 1:78.5.1-1~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/