After the first disclosure of CVEs related to speculative execution vulnerabilities (Meltdown and Spectre) on CPUs, a lot of researcher started to analyze the CPUs in order to find other vulerabilities and possible exploit techniques. Just some days ago a new a speculative execution attack on Intel processors has been released.
In-Spectre-Meltdown is a PoC developed by Viral Maniar using Python and Powershell to check speculative execution side-channel attacks that affect many modern processors and operating systems designs that allows unprivileged processes to steal secrets from privileged processes.
In the last hours, the vulnerabilities of the CPU have had a great prominence even in the non-specialized press. So, I think that would be useful trying to summarize the situation in a simple way.