{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-109363", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-12T14:21:32.594Z", "datePublished": "2026-10-12T16:05:41.576Z", "dateUpdated": "2026-10-12T16:05:41.576Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-12T16:05:41.576Z"}, "datePublic": "2026-09-25T00:00:00.000Z", "title": "Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Reachable Assertion", "cweId": "CWE-617", "type": "CWE"}]}], "affected": [{"vendor": "ZcashFoundation", "product": "zebra", "defaultStatus": "unaffected", "packageURL": "pkg:cargo/zebrad", "versions": [{"version": "6.4.0", "status": "affected", "versionType": "semver", "lessThan": "6.4.2"}, {"version": "6.4.2", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4.0", "versionEndExcluding": "6.4.2"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH"}}], "references": [{"url": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9", "tags": ["vendor-advisory"], "name": "GitHub Security Advisory (GHSA-h5rr-8pqv-grp9)"}, {"url": "https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e37851df49a", "tags": ["patch"], "name": "Patch Commit"}, {"name": "VulnCheck Advisory: Zebra 6.4.0 before 6.4.2 Denial of Service via Malformed v6 Transaction", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service-via-malformed-v6-transaction"}], "credits": [{"lang": "en", "value": "conradoplg", "type": "finder"}, {"lang": "en", "value": "mpguerra", "type": "coordinator"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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