{"id":"CVE-2026-104432","published":"2026-10-02T12:17:13.763","lastModified":"2026-10-06T03:17:00.513","description":"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.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-754"],"vendors":[],"products":[],"references":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h8m8-844p-v3m9","tags":[]},{"url":"https://www.vulncheck.com/advisories/zebra-before-6.3.0-false-readiness-via-discarded-one-hash-findblocks-response","tags":[]}],"exploitRefs":[{"url":"https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-h8m8-844p-v3m9","tags":[]}],"hasPoc":true,"ai":null}