A grub2 security update has been released for Debian GNU/Linux 10 LTS to address several issues.

DLA 3190-1: grub2 security update

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Debian LTS Advisory DLA-3190-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Steve McIntyre
November 16, 2022   https://wiki.debian.org/LTS
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Package : grub2
Version : 2.06-3~deb10u2
CVE ID : CVE-2022-2601 CVE-2022-3775

Several issues were found in GRUB2's font handling code, which could
result in crashes and potentially execution of arbitrary code. These
could lead to by-pass of UEFI Secure Boot on affected systems.

Further, issues were found in image loading that could potentially
lead to memory overflows.

For Debian 10 buster, these problems have been fixed in version
2.06-3~deb10u2.

We recommend that you upgrade your grub2 packages.

For the detailed security status of grub2 please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/grub2

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS