Description
Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inputs than outputs that Zebra accepts but zcashd rejects, causing a network consensus split.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ZcashFoundation | zebra | 4.4.0 – < 4.4.1, 6.0.0 – < 6.0.1 | 4.4.1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | zebra-script | < 6.0.1 | 6.0.1 | GHSA-pvmv-cwg8-v6c8 |
| crates.io | zebrad | < 4.4.1 | 4.4.1 | GHSA-pvmv-cwg8-v6c8 |
References
- GitHub Security Advisory (GHSA-pvmv-cwg8-v6c8) vendor-advisory
- VulnCheck Advisory: Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output third-party-advisory