{"id":"CVE-2026-104432","summary":"Zebra before 6.3.0 False Readiness via Discarded One-Hash FindBlocks Response","details":"Zebra before 6.3.0 contains an improper exceptional condition check in ChainSync::obtain_tips that discards valid one-hash FindBlocks responses, falsely reporting close-to-tip status. Peers returning only the next block hash cause a zero-length sync sample, making the /ready endpoint return 200 OK while the node remains behind the tip.","aliases":["GHSA-h8m8-844p-v3m9"],"modified":"2026-10-04T02:46:35.506475978Z","published":"2026-10-02T11:38:11.214Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-754"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104432.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104432.json"},{"type":"ADVISORY","url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h8m8-844p-v3m9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104432"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/zebra-before-6.3.0-false-readiness-via-discarded-one-hash-findblocks-response"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zcashfoundation/zebra","events":[{"introduced":"0"},{"fixed":"f5c5277fe41eba9c74f37098738f93f35dd70d60"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.3.0"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["zebra-utils-v10.0.0","zebra-state-v12.0.1","zebra-script-v10.1.2","zebra-rpc-v15.0.0","zebra-node-services-v9.1.2","zebra-network-v11.0.0","zebra-consensus-v14.0.1","zebra-chain-v11.3.0","v6.2.3","zebra-utils-v9.1.4","zebra-state-v12.0.0","zebra-rpc-v14.0.0","zebra-network-v10.2.1","zebra-consensus-v14.0.0","v6.2.2","zebra-utils-v9.1.3","zebra-state-v11.1.1","zebra-rpc-v13.0.0","zebra-consensus-v13.0.0","v6.2.1","zebra-state-v11.1.0","zebra-network-v10.2.0","zebra-consensus-v12.0.1","v6.2.0","zebra-utils-v9.1.1","zebra-state-v11.0.0","zebra-script-v10.1.1","zebra-rpc-v12.0.0","zebra-node-services-v9.1.1","zebra-network-v10.1.1","zebra-consensus-v12.0.0","zebra-chain-v11.2.0","v6.1.0","tower-fallback-v0.2.43","tower-batch-control-v1.1.1","zebra-utils-v9.1.0","zebra-state-v10.1.0","zebra-script-v10.1.0","zebra-rpc-v11.1.0","zebra-node-services-v9.1.0","zebra-network-v10.1.0","zebra-consensus-v11.0.0","zebra-chain-v11.1.0","v6.0.0","tower-fallback-v0.2.42","tower-batch-control-v1.1.0","v6.0.0-rc.0","v5.2.0","v5.1.0","v5.1.1","v5.0.0","v4.5.1","v4.5.0","v4.4.0","v4.4.1","v4.3.1","4.3.1","v4.3.0","v4.2.0","v4.1.0","v4.0.0","v3.1.0","v3.0.0","v3.0.0-rc.0","v2.5.0","v2.0.1","v2.4.2","v2.3.0","v2.4.0","v2.0.0","v2.2.0","v2.1.0","v2.0.0-rc.0","v1.9.0","v1.8.0","v1.7.0","v1.6.1","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.0","v1.2.0","v1.1.0","v1.0.1","v1.0.0","v1.0.0-rc.9","v1.0.0-rc.8","v1.0.0-rc.7","v1.0.0-rc.6","v1.0.0-rc.5","v1.0.0-rc.0","v1.0.0-rc.4","v1.0.0-rc.3","v1.0.0-rc.2","v1.0.0-rc.1","v1.0.0-beta.15","v1.0.0-beta.14","v1.0.0-beta.13","v1.0.0-beta.12","v1.0.0-beta.11","v1.0.0-beta.10","v1.0.0-beta.9","v1.0.0-beta.8","v1.0.0-beta.7","v1.0.0-beta.6","v1.0.0-beta.5","v1.0.0-beta.4","v1.0.0-beta.3","v1.0.0-beta.2","v1.0.0-beta.1","v1.0.0-beta.0","v1.0.0-alpha.19","v1.0.0-alpha.18","v1.0.0-alpha.17","v1.0.0-alpha.16","v1.0.0-alpha.15","v1.0.0-alpha.14","v1.0.0-alpha.13","v1.0.0-alpha.12","v1.0.0-alpha.11","v1.0.0-alpha.10","v1.0.0-alpha.9","v1.0.0-alpha.8","v1.0.0-alpha.7","v1.0.0-alpha.6","v1.0.0-alpha.5","v1.0.0-alpha.4","v1.0.0-alpha.3","v1.0.0-alpha.2","v1.0.0-alpha.1","v1.0.0-alpha.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104432.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}