XMLTooling-C before 1.5.5, as used in OpenSAML-C and Shibboleth Service Provider (SP), does not properly handle integer conversion exceptions, which allows remote attackers to cause a denial of service (crash) via schema-invalid XML data.
http://www.securityfocus.com/bid/76134
http://www.debian.org/security/2015/dsa-3321
http://shibboleth.net/community/advisories/secadv_20150721.txt