{"id":"CVE-2026-109366","revision":"3751d3e1b4b447a2a482b1b2383b8cb7","records":[{"revision":"3751d3e1b4b447a2a482b1b2383b8cb7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109366","aliases":[],"title":"Zebra before 6.4.0 Gossiped Block Drop via Forged Coinbase scriptSig Height","description":"Zebra before 6.4.0 contains an improper integrity validation vulnerability in the inbound gossip download path that allows unauthenticated peers to force dropping of new blocks without penalty. Attackers can serve a real block with a coinbase scriptSig rewritten to height 1, which keeps the ZIP-244 block hash, triggering a behind-tip drop before consensus validation and delaying tip discovery for mining backends.","state":0,"publishedAt":"2026-10-12T16:05:43.62+00:00","modifiedAt":"2026-10-12T16:05:43.62+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\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"6.4.0\"\n                        },\n                        {\n                            \"version\": \"6.4.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","score":3.7,"severity":"LOW"}],"references":["https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4f6v-mj46-gxg3","https://www.vulncheck.com/advisories/zebra-before-6.4.0-gossiped-block-drop-via-forged-coinbase-scriptsig-height"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109366","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109366","identifiers":["CVE-2026-109366"]},"retained":false,"historicalAffected":[]}],"coverage":[]}