From TFA:

> How on earth was this not found before this???

https://github.com/rust-lang/rust/issues/164250#issuecomment...

> Assigning P-high

https://github.com/rust-lang/rust/issues/164250#issuecomment...

In general I agree with fg137's assessment of soundness bugs as being inherently high-impact, i.e., serious:

> The Rust community is well aware that such bugs exist, will be found, and address them just like other high impact bugs.