A thunderbird security update has been released for Debian GNU/Linux 11 and 12 to address a buffer overflow in parsing WebP images.

[SECURITY] [DSA 5498-1] thunderbird security update

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Debian Security Advisory DSA-5498-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
September 15, 2023 https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2023-4863

A buffer overflow in parsing WebP images may result in the execution of
arbitrary code.

For the oldstable distribution (bullseye), this problem has been fixed
in version 1:102.15.1-1~deb11u1.

For the stable distribution (bookworm), this problem has been fixed in
version 1:102.15.1-1~deb12u1.

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/