CVE-2015-1607: Improper Input Validation

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 overlappi...