Related discussion on hacker news: https://news.ycombinator.com/item?id=50172041
The demo video has been going around Twitter today and apparently the proof of concept is privately being shared around too. The video shows pasting something in the URL and then gaining a shell on the server. It looks completely catastrophic.
I think the best course of action is to just shut your server down before the patch goes live and then bring it back after you have patched.
video here: https://twitter.com/k_firsov/status/2112641845926989944
(Look for a Nitter instance if you don't want to use twitter)
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