CVE-2026-104436
Low
Description
Zebra before 4.5.0 contains an uncontrolled resource consumption vulnerability that allows remote P2P peers to exhaust blocking-pool threads by sending oversized block locator vectors. Attackers can send getblocks or getheaders messages with up to 65,535 locator hashes, triggering per-hash chain lookups that degrade block validation, RPC, and mempool performance.
SeverityLow
CVSS3.7
Exploit probability—
ProductZcashfoundation Zebra
PublishedOct 2, 2026
First seenOct 2, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- ZcashFoundation zebra4.5.0 or later
- ZcashFoundation zebra-chain8.0.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ZcashFoundation zebra | v < 4.5.0 | 4.5.0 |
| ZcashFoundation zebra-chain | v < 8.0.0 | 8.0.0 |
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