CVE-2026-41583
Description
ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between Zebra and zcashd nodes. In a similar vein, for V4 transactions, Zebra mistakenly used the "canonical" hash type when computing the sighash while zcashd (correctly per the spec) uses the raw value, which could also crate a consensus split. This issue has been patched in zebrad version 4.3.1 and zebra-script version 5.0.2.
How to fix
- zfnd zebra-script5.0.2 or later
- zfnd zebrad4.3.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| zfnd zebra-script | v < 5.0.2 | 5.0.2 |
| zfnd zebrad | v < 4.3.1 | 4.3.1 |
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