Double free vulnerability in libgnutls in GnuTLS before 3.0.14 allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted certificate list.
https://exchange.xforce.ibmcloud.com/vulnerabilities/74099
http://www.exploit-db.com/exploits/24865
http://article.gmane.org/gmane.comp.encryption.gpg.gnutls.devel/5866