{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"zebrad","product":"zebra","source":"CNA: VulnCheck","vendor":"ZcashFoundation","versions":[{"lessThan":"7.0.0","status":"affected","version":"2.3.0","versionType":"semver"},{"status":"unaffected","version":"7.0.0","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"zebra-consensus","product":"zebra","source":"CNA: VulnCheck","vendor":"ZcashFoundation","versions":[{"lessThan":"18.0.0","status":"affected","version":"1.0.0-beta.46","versionType":"semver"},{"status":"unaffected","version":"18.0.0","versionType":"semver"}]}],"cveId":"CVE-2026-123555","cwes":["CWE-755"],"description":"Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.","epss":{"date":"2026-11-12","percentile":0.3788,"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":1794538928303,"publishedAt":1794101877593,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jq45-ghw5-v37x"},{"source":"CNA: VulnCheck","tags":["patch"],"url":"https://github.com/ZcashFoundation/zebra/commit/e8db87eb69254e0d4eedd058eadd48bdfa09065a"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/zebra-2.3.0-before-7.0.0-denial-of-service-via-unscored-script-verification-failures"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ZcashFoundation/zebra/commit/e8db87eb69254e0d4eedd058eadd48bdfa09065a"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jq45-ghw5-v37x"},{"source":"disclosure@vulncheck.com","tags":[],"url":"https://www.vulncheck.com/advisories/zebra-2.3.0-before-7.0.0-denial-of-service-via-unscored-script-verification-failures"}],"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/e8db87eb69254e0d4eedd058eadd48bdfa09065a"}],"revision":"36b33e3fd4cdf8a4175a155400fd76b1e52884072fb83d6a2e2b2dcb6da4e360","sources":[{"modifiedAt":1794538928303,"name":"CNA: VulnCheck","retrievedAt":1794539330812,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123555"},{"modifiedAt":1794104207443,"name":"NVD","retrievedAt":1794118573790,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-123555"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1794539348573,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-123555"}],"ssvc":{"assessedAt":1794538916391,"automatable":"yes","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"partial"},"status":"published","title":"Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures","updatedAt":1794539348573}