The libksba library 0.9.12 and possibly other versions, as used by gpgsm in the newpg package on SUSE LINUX, allows attackers to cause a denial of service (application crash) via a malformed X.509 certificate in a signature.
https://exchange.xforce.ibmcloud.com/vulnerabilities/29621
http://www.ubuntu.com/usn/usn-365-1
http://www.securityfocus.com/bid/20565
http://www.novell.com/linux/security/advisories/2006_23_sr.html
http://www.novell.com/linux/download/updates/101_x86_64.html
http://www.mandriva.com/security/advisories?name=MDKSA-2006:183
http://secunia.com/advisories/22473