C++ Memory Leak Using char *

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You have your

char *cstr = new char[data.size() + 1];

and the corresponding

delete[] cstr;

and these are implemented correctly (matching new[] with delete[]).
Nowhere else in your code do you allocate memory on the heap, and I don’t see anywhere that cstr is modified either.

All of these suggest that you don’t have a memory leak, or at least, not in the code you have submitted here.

If you think you have a memory leak, you should confirm it. Check the output from Valgrind (or a suitable alternative).

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