{"id":"CVE-2026-109363","summary":"Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction","details":"ZcashFoundation Zebra 6.4.0 before 6.4.2 parses version 6 transactions carrying a pre-NU6.3 consensus branch ID, but the size computation during UnminedTx construction treats re-serialization of the Orchard bundle as infallible, so the resulting error trips an expect that aborts zebrad. Unauthenticated peers can send a single pre-handshake tx message to crash the node, and can repeat this after each restart.","aliases":["GHSA-h5rr-8pqv-grp9"],"modified":"2026-10-15T02:30:52.160859650Z","published":"2026-10-12T16:05:41.576Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-617"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109363.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109363.json"},{"type":"ADVISORY","url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109363"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service-via-malformed-v6-transaction"},{"type":"FIX","url":"https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e37851df49a"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zcashfoundation/zebra","events":[{"introduced":"aedb094dc6dd13a0a565947e7ab4466a8b149d39"},{"fixed":"e3eef2f37c35127ad1769f19a1ebc7eaa5d5d291"},{"fixed":"008abac5c99e872f283450d596d95e37851df49a"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"6.4.0"},{"fixed":"6.4.2"}]}}],"versions":["v6.4.1","zebra-utils-v10.0.2","zebra-state-v14.0.0","zebra-script-v12.0.0","zebra-rpc-v17.0.0","zebra-node-services-v11.0.0","zebra-network-v13.0.0","zebra-consensus-v16.0.0","zebra-chain-v13.0.0","v6.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109363.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}