A thunderbird security update has been released for Debian GNU/Linux 10 to address multiple security issues.

DSA 4927-1: thunderbird security update

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Debian Security Advisory DSA-4927-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 05, 2021   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2021-29956 CVE-2021-29957 CVE-2021-29967

Multiple security issues were discovered in Thunderbird, which could
result in the execution of arbitrary code. In adddition two security
issues were addressed in the OpenPGP support.

For the stable distribution (buster), these problems have been fixed in
version 1:78.11.0-1~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/