Vulnerability in Zcashfoundation Zebra
CVE-2026-104432
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ZcashFoundation/zebra/security/advisories/GHSA-h8m8-844p-v3m9 (vendor-advisory)
- www.vulncheck.com/advisories/zebra-before-6.3.0-false-readiness-via-discarded-o… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-104432?
- CVE-2026-104432 is a medium-severity vulnerability in Zcashfoundation Zebra, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.3/10. Published 2026-10-02.
- How severe is CVE-2026-104432?
- Medium severity. CVSS v3 base score is 5.3 out of 10.