A libreoffice security update has been released for Debian GNU/Linux 11 to address two security issues.

DSA 4988-1: libreoffice security update

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Debian Security Advisory DSA-4988-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
October 16, 2021   https://www.debian.org/security/faq
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Package : libreoffice
CVE ID : CVE-2021-25633 CVE-2021-25634

Two security issues have been discovered in LibreOffice's support for
digital signatures in ODF documents, which could result in incorrect
signature indicators/timestamps being presented.

For the stable distribution (bullseye), these problems have been fixed in
version 1:7.0.4-4+deb11u1.

We recommend that you upgrade your libreoffice packages.

For the detailed security status of libreoffice please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libreoffice

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/