Go would stop this from being exploitable. You might be able to make a slice larger than it is "supposed" to be, but it won't overwrite anything else because Go will be allocating new memory for your bigger slice.

But this is hardly a big claim for Go. The reality is that of all current languages in use, only C and C++ will let this mistake happen and have the consequence of overwriting whatever happens to be in the way. Everything else is too memory safe for this to happen.