{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"zebrad","product":"zebra","source":"CNA: VulnCheck","vendor":"ZcashFoundation","versions":[{"lessThan":"7.0.0","status":"affected","version":"6.4.0","versionType":"semver"},{"status":"unaffected","version":"7.0.0","versionType":"semver"}]}],"cveId":"CVE-2026-123554","cwes":["CWE-407"],"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.","epss":{"date":"2026-11-09","percentile":0.37674,"score":0.00432},"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},{"score":8.7,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","version":"4.0"},{"score":7.5,"severity":"high","source":"NVD: disclosure@vulncheck.com","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794232704460,"publishedAt":1794101876894,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-7jp4-mq53-4cvq"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/ZcashFoundation/zebra/commit/08743d669b33a19bce2a5d54001bd468c03a196e"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zebra-zebrad-6.4.0-before-7.0.0-denial-of-service-via-mempool-coinbase-maturity-check"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ZcashFoundation/zebra/commit/08743d669b33a19bce2a5d54001bd468c03a196e"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-7jp4-mq53-4cvq"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/zebra-zebrad-6.4.0-before-7.0.0-denial-of-service-via-mempool-coinbase-maturity-check"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/ZcashFoundation/zebra/commit/08743d669b33a19bce2a5d54001bd468c03a196e"}],"revision":"52e3f47e5f4672dfcf1002d00819439df0b9467ba7b99c1c584e079bb1d94baf","sources":[{"modifiedAt":1794232704460,"name":"CNA: VulnCheck","retrievedAt":1794233352664,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123554"},{"modifiedAt":1794104207263,"name":"NVD","retrievedAt":1794118573605,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123554"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794237013302,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123554"}],"ssvc":{"assessedAt":1794232694717,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Zebra zebrad 6.4.0 before 7.0.0 Denial of Service via Mempool Coinbase-Maturity Check","updatedAt":1794237013302}