GHSA-M6WQ-66P2-C8PC Babylon Nil BlockHash in BLS vote extensions triggers panics in consensus handlers

Summary A vulnerability exists in Babylon’s BLS vote extension processing where a malicious active validator can submit a VoteExtension with the blockhash field omitted from the protobuf serialization. Because protobuf fields are optional, unmarshalling succeeds but leaves BlockHash as nil. Babyl...