CVE-2026-40880
Description
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.
How to fix
- zfnd zebra-consensus5.0.2 or later
- zfnd zebrad4.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zfnd zebra-consensus | v < 5.0.2 | 5.0.2 |
| zfnd zebrad | v < 4.3.1 | 4.3.1 |
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