CVE-2026-104432
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductZcashfoundation Zebra
PublishedOct 2, 2026
First seenOct 2, 2026
Weakness typeCWE-754CWE-754
How to fix
Update
- ZcashFoundation zebra6.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ZcashFoundation zebra | v < 6.3.0 | 6.3.0 |
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