More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2376493 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The only use of protobuf is in rust-analyzer via scip (https://crates.io/crates/scip) to *output* files, so an untrusted-input vulnerability doesn't apply. (Also, in general, all input to rust-analyzer is considered trusted.)