Security threat due to insecure function "malloc()" in GCDAsyncSocket.m

https://github.com/robbiehanson/CocoaAsyncSocket/blob/master/Source/GCD/GCDAsyncUdpSocket.m
I am getting security threat in GCDAsyncUdpSocke.m class file 

There is occurrences of malloc() function which is an insecure function acc to security tool.

void *buf = malloc(bufSize);
void *buf = malloc(bufSize);

Below is the issue description and reference links from security team.
Issue description:   Use of insecure functions/potential dangerous functions
Reference links:   CWE-676: Use of Potentially Dangerous Function
CWE-789 - Uncontrolled Memory Allocation 

This would explain why SECURITY TEAM is recommending the change of these functions.

Thanks and Regards