---
id: CVE-2026-104425
title: >-
  ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion
  vulnerability that allows unauthenticated peers to degrade block processing by
  pushing transactions with invalid Orchard proofs without being
  misbehavior-scored
summary: >-
  ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion
  vulnerability that allows unauthenticated peers to degrade block processing by
  pushing transactions with invalid Orchard proofs without being
  misbehavior-scored. Attackers…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-405
vendor: ZcashFoundation
product: zebra
affected:
  - zebra < 6.1.0
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T12:17:12.730'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104425'
references:
  - url: >-
      https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-g7c4-2w6c-cr3r
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/zebra-before-6.1.0-batch-verification-poisoning-dos-via-unattributed-pushed-transactions
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T12:17:44.331Z'
---

## Overview

ZcashFoundation Zebra before 6.1.0 contains a resource exhaustion vulnerability that allows unauthenticated peers to degrade block processing by pushing transactions with invalid Orchard proofs without being misbehavior-scored. Attackers can repeatedly push invalid proofs into the shared halo2 batch verifier, forcing honest block proofs onto the slow individual-verification path and slowing block processing roughly sevenfold.

## Remediation

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