HIGH 8.2 NVD
CVE-2026-104426
Zebra before 6.1.0 contains an inefficient algorithmic complexity vulnerability in remaining_transaction_value that clones the entire block-level spent-UTXO map
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.
References
- https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4g24-549m-hp75
- https://www.vulncheck.com/advisories/zebra-before-6.1.0-quadratic-complexity-dos-via-block
This high severity vulnerability with a CVSS score of 8.2 was published on 2026-10-02 via NVD.
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