CVE-2026-104426 [MEDIUM] – Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remaini

Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remaining_transaction_value that clones the entire block-level spent-UTXO map per transaction during contextual verification. Attackers can mine or seed the mempool with roughly 26,000 minimal single-input transactions in one block, stalling every validating node for over 52 seconds.