---
id: CVE-2026-34377
title: ZEBRA is a Zcash node written entirely in Rust
summary: >-
  ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0
  and zebra-consensus version 5.0.1, a logic error in Zebra's transaction
  verification cache could allow a malicious miner to induce a consensus split.
  By matchi…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-347
vendor: zfnd
product: zebra
affected:
  - zebra < 4.3.0
  - zebra-consensus < 5.0.1
patched:
  - zebra 4.3.0
  - zebra-consensus 5.0.1
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34377'
references:
  - url: 'https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh
    label: security-advisories@github.com
  - url: >-
      https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00383
epssPercentile: 0.29519
ingestedAt: '2026-07-24T21:39:13.550Z'
---

## Overview

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.

## Affected

- `zebra < 4.3.0`
- `zebra-consensus < 5.0.1`

## Remediation

Upgrade past the affected range:

- `zebra 4.3.0`
- `zebra-consensus 5.0.1`