An issue was discovered in the v9 crate through 2020-12-18 for Rust. There is an unconditional implementation of Sync for SyncRef<T>.
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-36447.json"
[ { "events": [ { "introduced": "0" }, { "last_affected": "0.1.41" } ] } ]