rpc.py through 0.6.0 allows Remote Code Execution because an unpickle occurs when the "serializer: pickle" HTTP header is sent. In other words, although JSON (not Pickle) is the default data format, an unauthenticated client can cause the data to be processed with unpickle.
{
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/35xxx/CVE-2022-35411.json",
"cna_assigner": "mitre"
}