{"schema":"threatline.record/2","record":{"id":"CVE-2026-109363","aliases":["GHSA-h5rr-8pqv-grp9"],"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.","categories":["Unclassified"],"product":"zebra","vendor":"ZcashFoundation","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109363","source_modified_at":"2026-10-13T16:22:00.063Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"zebra","vendor":"ZcashFoundation","versions":[{"version":"6.4.0","status":"affected","versionType":"semver","lessThan":"6.4.2"},{"version":"6.4.2","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109363","source_modified_at":"2026-10-13T16:22:00.063Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"zebra","ecosystem":null},"version":"6.4.2","basis":"first unaffected version stated in the CVE record"}],"cvss":8.7,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00432,"percentile":0.36386,"score_date":"2026-10-23"},"published_at":"2026-10-12T16:05:41.576Z","modified_at":"2026-10-13T16:22:00.063Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-109363","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-13T16:22:00.063Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-109363","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h5rr-8pqv-grp9","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://github.com/ZcashFoundation/zebra/commit/008abac5c99e872f283450d596d95e37851df49a","tags":["patch"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/zebra-6.4.0-before-6.4.2-denial-of-service-via-malformed-v6-transaction","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"partial","assessed_at":"2026-10-13T16:21:21.592601Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-13T16:22:00.063Z","content_hash":"f75ab31903eb2d26ce291393a48210a0e0a98981b125306a64c9ce4b18bf1d72"}}