I wrote a thing that got quite the traction on the internet, which is merely a summary of something awesome that someone else found.

You can read it here: https://www.zksecurity.xyz/blog/posts/nova-attack/

the first paragraph to give you an idea:

Last week, a strange paper (by Wilson Nguyen et al.) came out: Revisiting the Nova Proof System on a Cycle of Curves. Its benign title might have escaped the attention of many, but within its pages lied one of the most impressive and devastating attack on a zero-knowledge proof (ZKP) system that we’ve ever seen. As the purpose of a ZKP system is to create a cryptographic proof certifying the result of a computation, the paper demonstrated a false computation result accompanied with a valid proof.