Details about the exploits have already been leaked on twitter, don't want to put the details here but if its correct then it can be mitigated by setting session.upload_progress.enabled = Off
I have heard Kirill Firsov say that, but does anyone even know the vulnerabilities? Could be a meme.
Yes its two hanging pointers related to the upload progress handler that can be used for RCE after some heap grooming, disabling upload progress means that the function that contains the vulnerable code never runs.
session.use_strict_mode = 1 as well. some advice around disabling multipart uploads too.