Format string vulnerability in gpgkeys_hkp (experimental HKP interface) for the GnuPG (gpg) client 1.2.3 and earlier, and 1.3.3 and earlier, allows remote attackers or a malicious keyserver to cause a denial of service (crash) and possibly execute arbitrary code during key retrieval.
https://exchange.xforce.ibmcloud.com/vulnerabilities/13892
http://www.s-quadra.com/advisories/Adv-20031203.txt
http://www.novell.com/linux/security/advisories/2003_048_gpg.html