Well usually you can just update whatever library has the bug and restart your applications, but as I understand this bug will be statically linked in all application binaries so they will all have to be recompiled and redeployed?

Yes, that's what the grandparent is saying, this is a bug in the runtime, which you can't fix by updating libraries, you have to update the compiler/interpreter (depending on the language).

This is not a unique occurrence.

I think the original question was querying if the runtime is statically or dynamically linked.

It's also possibly a subtle dig at go, because unlike other languages go does not use dynamic linking, meaning bugs in libraries require recompilation (has positive effects too).

Yes it does, since Go 1.6.

It just isn't the default compilation mode, you have to explicitly enable it.

Runtimes have bugs but normally you just download a new one and swap it out.