{"id":"CVE-2026-123554","published":"2026-11-08T02:16:47.120","lastModified":"2026-11-09T14:17:11.103","description":"Zebra zebrad 6.4.0 before 7.0.0 performs quadratic work in the mempool coinbase-maturity check because Transaction::coinbase_spend_restriction() rebuilds the transaction's output list once per spent outpoint. Any connected peer can repeatedly send unsigned transactions with many transparent inputs and outputs, which are rejected without a misbehavior score, to pin verification threads.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-407"],"vendors":[],"products":[],"references":[{"url":"https://github.com/ZcashFoundation/zebra/commit/08743d669b33a19bce2a5d54001bd468c03a196e","tags":[]},{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-7jp4-mq53-4cvq","tags":[]},{"url":"https://www.vulncheck.com/advisories/zebra-zebrad-6.4.0-before-7.0.0-denial-of-service-via-mempool-coinbase-maturity-check","tags":[]}],"exploitRefs":[{"url":"https://github.com/ZcashFoundation/zebra/commit/08743d669b33a19bce2a5d54001bd468c03a196e","tags":[]},{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-7jp4-mq53-4cvq","tags":[]}],"hasPoc":true,"ai":null}