---
id: CVE-2026-104419
title: >-
  Zebra (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block
  hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban
  threshold, to whichever peer serves a requested block more than 50,000 heights
  above th…
summary: >-
  Zebra (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block
  hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban
  threshold, to whichever peer serves a requested block more than 50,000 heights
  above th…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-345
vendor: ZcashFoundation
product: zebra
affected:
  - zebra < 6.3.0
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T12:17:11.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104419'
references:
  - url: >-
      https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-qhr3-cvch-5fh2
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/zebra-before-6.3.0-honest-peer-banning-via-far-ahead-findblocks-hashes
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T12:17:44.329Z'
---

## Overview

Zebra (zebrad) 4.5.0 before 6.3.0 discards which peer supplied the block hashes in FindBlocks responses, then assigns 100 misbehavior points, the ban threshold, to whichever peer serves a requested block more than 50,000 heights above the tip. A remote peer can return real far-ahead hashes to a syncing node so that honest peers get banned, eroding its peer set and raising eclipse risk.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.