---
title: "CVE-2026-41583: Zebra Vulnerable to Consensus Divergence in Transparent Sighash Hash-Type Handling"
url: https://erroneo.us/security/cve/CVE-2026-41583/
description: "CVE-2026-41583 (zebrad (crates.io (Rust))): ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-08
date_modified: 2026-05-12
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-41583"
kev: false
cvss: 9.3
epss: 0.00473
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-41583: Zebra Vulnerable to Consensus Divergence in Transparent Sighash Hash-Type Handling

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.5% , percentile 40: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 40% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes zebrad (crates.io (Rust)) < 4.3.1, fixed in 4.3.1 ; zebra-script (crates.io (Rust)) < 5.0.2, fixed in 5.0.2 . Check your lockfile, including transitive dependencies.

## What it is

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 packages

- crates.io (Rust) `zebrad` < 4.3.1 → fixed: 4.3.1
- crates.io (Rust) `zebra-script` < 5.0.2 → fixed: 5.0.2

## Affected products (CVE record)

- ZcashFoundation zebra: zebrad < 4.3.1, zebra-script < 5.0.2

## Severity

- GitHub_M CVSS 4.0: 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`
- GitHub CVSS 4.0: 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`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.47% probability of exploitation activity in the next 30 days; percentile 40.

## Sources

- [GitHub Advisory GHSA-8m29-fpq5-89jj](https://github.com/advisories/GHSA-8m29-fpq5-89jj)
- [CVE.org record CVE-2026-41583](https://www.cve.org/CVERecord?id=CVE-2026-41583)
- [NVD entry CVE-2026-41583](https://nvd.nist.gov/vuln/detail/CVE-2026-41583)
- [github.com](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj)
- [github.com](https://github.com/ZcashFoundation/zebra/commit/1f605eca5c55e3b65229fa01a97d9aa84fd37447)

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Source page: https://erroneo.us/security/cve/CVE-2026-41583/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt