Buffer overflow in pks PGP public key web server before 0.9.5 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long search argument to the lookup capability.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-0891
http://www.securityfocus.com/bid/4828
http://www.rubin.ch/pgp/src/patch_buffoverflow20020525