{"id":"CVE-2026-123559","title":"Zebra before 7.0.0 Denial of Service via Quadratic Sighash Computation","summary":"Zebra before 7.0.0 contains an inefficient algorithmic complexity vulnerability that allows unauthenticated peers to exhaust verification threads by submitting transactions with many transparent inputs. Attackers can relay invalid transa…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-407"],"vendor":"ZcashFoundation","product":"zebra","affected":["zebra < 7.0.0"],"published":"2026-11-08","updated":"2026-11-08","sourceUpdated":"2026-11-08T01:38:00.337Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-123559","references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-j4cw-58mj-7w6v","label":"GitHub Security Advisory (GHSA-j4cw-58mj-7w6v)"},{"url":"https://www.vulncheck.com/advisories/zebra-before-7.0.0-denial-of-service-via-quadratic-sighash-computation","label":"VulnCheck Advisory: Zebra before 7.0.0 Denial of Service via Quadratic Sighash Computation"}],"tags":["cve.org"],"ingestedAt":"2026-11-08T02:43:18.663Z","slug":"CVE-2026-123559","body":"## Overview\n\nZebra before 7.0.0 contains an inefficient algorithmic complexity vulnerability that allows unauthenticated peers to exhaust verification threads by submitting transactions with many transparent inputs. Attackers can relay invalid transactions with tens of thousands of inputs, forcing quadratic ZIP-244 or ZIP-243 digest recomputation that stalls Rayon-backed block verification for minutes.\n\n## Affected\n\n- `zebra < 7.0.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}