CVE-2026-104427
Medium
Description
Zebra before 6.1.0 contains an incomplete cleanup vulnerability in the state write task that allows remote unauthenticated peers to stall node synchronization by poisoning parent_error_map. Attackers can deliver a coinbase-malleated block sharing a canonical block's hash before it propagates, causing the next canonical block to be rejected and stalling the node for roughly 2,000 blocks.
SeverityMedium
CVSS5.9
Exploit probability—
ProductZcashfoundation Zebra
PublishedOct 2, 2026
First seenOct 2, 2026
Weakness typeCWE-459CWE-459
How to fix
Update
- ZcashFoundation zebra6.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ZcashFoundation zebra | v < 6.1.0 | 6.1.0 |
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