I'm planning to spend my evening checking every other Ed25519 implementation I can find to see if this check is missing any where else in the open source ecosystem.
I found several libraries that simply didn't implement the check, but none that implemented in incorrectly in the same way as the vulnerability discussed above.
> Did you also check all of the libraries that implement the check differently to libsodium?
Yes, but it was a breadth-first search sourced from the ianix webpage, so I certainly missed some details somewhere. I'll continue to search over the coming weeks in my spare time (if I can get any).
I'm planning to spend my evening checking every other Ed25519 implementation I can find to see if this check is missing any where else in the open source ecosystem.