What’s Vulnerable › Vulnerabilities
CVE-2026-41583: ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-08 · updated 2026-10-26
- Weakness: CWE-573
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.
Affected products
- Zfnd Zebra-Script: before 5.0.2 — fixed in 5.0.2
- ZcashFoundation zebra: before 4.3.1 — fixed in 4.3.1
How to fix
Upgrade to a fixed version: Zfnd Zebra-Script 5.0.2; ZcashFoundation zebra 4.3.1. Check the vendor advisory for mitigations.
References
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