# CVE-2026-41583

## Summary

- **CVE ID:** CVE-2026-41583
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H)
- **CWE:** CWE-573
- **Published:** May 8, 2026
- **Last Modified:** May 8, 2026

## 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

- ZcashFoundation — zebra (zebrad < 4.3.1)
- ZcashFoundation — zebra (zebra-script < 5.0.2)

## References

- [CNA](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._