{"id":"CVE-2026-104436","revision":"017c34202bf94f9bba3fd0abbaa07fbe","records":[{"revision":"017c34202bf94f9bba3fd0abbaa07fbe","observedAt":"2026-10-29T21:48:56.968+00:00","statement":{"source":"cve-program","id":"CVE-2026-104436","aliases":[],"title":"Zebra before 4.5.0 CPU Amplification via Uncapped getblocks/getheaders Locator Length","description":"Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.","state":0,"publishedAt":"2026-10-02T11:38:13.172+00:00","modifiedAt":"2026-10-29T20:19:16.195+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\": \"4.5.0\"\n                        },\n                        {\n                            \"version\": \"4.5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"zebra-chain","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"ZcashFoundation\",\n                    \"product\": \"zebra-chain\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:cargo/zebra-chain\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"8.0.0\"\n                        },\n                        {\n                            \"version\": \"8.0.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:H/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-443g-gwgp-49x4","https://www.vulncheck.com/advisories/zebra-before-4.5.0-cpu-amplification-via-uncapped-getblocks-getheaders-locator-length"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-104436","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-104436","identifiers":["CVE-2026-104436"]},"retained":false,"historicalAffected":[]}],"coverage":[]}