Versions mentioned in the description apply to the upstream
Remediation section below for
Debian:10 relevant versions.
kbx/keybox-search.c in GnuPG before 1.4.19, 2.0.x before 2.0.27, and 2.1.x before 2.1.2 does not properly handle bitwise left-shifts, which allows remote attackers to cause a denial of service (invalid read operation) via a crafted keyring file, related to sign extensions and "memcpy with overlapping ranges."
gnupg2 to version 2.0.26-5 or higher.