Jansson 2.7 and earlier allows context-dependent attackers to cause a denial of service (deep recursion, stack consumption, and crash) via crafted JSON data.
https://github.com/akheron/jansson/pull/284/commits/64ce0ad3731ebd77e02897b07920eadd0e2cc318
https://github.com/akheron/jansson/pull/284
https://github.com/akheron/jansson/issues/282
http://www.openwall.com/lists/oss-security/2016/05/03/3
http://www.openwall.com/lists/oss-security/2016/05/02/1