Is CVE-2026-104426 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-104426?

CVE-2026-104426 has a CVSS v3 severity of MEDIUM (5.9).

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CVE-2026-104426

Description

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.