{"id":"CVE-2026-109363","revision":"36cb7c8235034cf4a2b7c7c9a5775960","records":[{"revision":"36cb7c8235034cf4a2b7c7c9a5775960","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109363","aliases":[],"title":"Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction","description":"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.","state":0,"publishedAt":"2026-10-12T16:05:41.576+00:00","modifiedAt":"2026-10-13T16:22:00.063+00:00","affected":[{"ecosystem":"Vendor product","name":"zebra","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"ZcashFoundation\",\n                    \"product\": \"zebra\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:cargo/zebrad\",\n                    \"versions\": [\n                        {\n                            \"version\": \"6.4.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"6.4.2\"\n                        },\n                        {\n                            \"version\": \"6.4.2\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.7,"severity":"HIGH"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9","https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e37851df49a","https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service-via-malformed-v6-transaction"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109363","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109363","identifiers":["CVE-2026-109363"]},"retained":false,"historicalAffected":[]}],"coverage":[]}