{"id":"CVE-2026-104427","title":"Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map","summary":"Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated bloc…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-459"],"vendor":"ZcashFoundation","product":"zebra","affected":["zebra < 6.1.0"],"published":"2026-10-02","updated":"2026-10-05","sourceUpdated":"2026-10-05T15:17:15.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-104427","references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8gxx-hc65-vv82","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/zebra-before-6.1.0-chain-stall-via-stale-parent-error-map-entry","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-05T14:53:37.615214Z"},"epss":0.00308,"epssPercentile":0.23477,"ingestedAt":"2026-10-02T12:17:44.332Z","slug":"CVE-2026-104427","body":"## Overview\n\nZebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causing the next canonical block to be rejected and stalling the node for roughly 2,000 blocks.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}