CVE-2026-52739

Affected: zebrad up to v4.4.1. Root cause: Chain::push in zebra-state/src/service/non_finalized_state/chain.rs:1608-1628 inserts the transaction hash into tx_loc_by_hash with an assert_eq! before running the duplicate shielded-nullifier guard, so a repeated shielded transaction in a child block t...