Buffer overflow in Dan Pascu python-cjson 1.0.5, when UCS-4 encoding is enabled, allows context-dependent attackers to cause a denial of service (application crash) or possibly have unspecified other impact via vectors involving crafted Unicode input to the cjson.encode function.
https://bugs.launchpad.net/ubuntu/+source/python-cjson/+bug/585274
http://www.vupen.com/english/advisories/2010/1774
http://www.debian.org/security/2010/dsa-2068