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Test your applicationsThere is no fixed version for Debian:11 grub2.
Note: Versions mentioned in the description apply only to the upstream grub2 package and not the grub2 package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
A Use-After-Free vulnerability has been discovered in GRUB's gettext module. This flaw stems from a programming error where the gettext command remains registered in memory after its module is unloaded. An attacker can exploit this condition by invoking the orphaned command, causing the application to access a memory location that is no longer valid. An attacker could exploit this vulnerability to cause grub to crash, leading to a Denial of Service. Possible data integrity or confidentiality compromise is not discarded.