GnuPG (gpg) 1.4.8 and 2.0.8 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via crafted duplicate keys that are imported from key servers, which triggers "memory corruption around deduplication of user IDs."
Exploit prediction scoring system (EPSS) score
EPSS Score 0.04
EPSS Ranking 87.8%