Multiple integer overflows in the (1) CallMalloc (malloc) and (2) nedpcalloc (calloc) functions in nedmalloc (nedmalloc.c) before 1.10 beta2 make it easier for context-dependent attackers to perform memory-related attacks such as buffer overflows via a large size value, which causes less memory to be allocated than expected.
https://github.com/ned14/nedmalloc/blob/master/Readme.html
http://www.openwall.com/lists/oss-security/2012/06/07/13
http://www.openwall.com/lists/oss-security/2012/06/05/1
http://kqueue.org/blog/2012/03/05/memory-allocator-security-revisited/