---
title: "CVE-2026-104435: Zebra zebrad & zebra-script - Authentication Bypass"
description: "Zebra zebrad 4.4.0 and zebra-script 6.0.0 contain a consensus rule enforcement bypass caused by accepting V5 transparent inputs signed with SIGHASH_SINGLE lacking corresponding outputs, letting attackers cause network consensus split, exploit requires crafted V5 transactions."
url: https://panop.io/threat-heartbeat/CVE-2026-104435/
---

# CVE-2026-104435 Zebra zebrad & zebra-script - Authentication Bypass

Zebra zebrad 4.4.0 and zebra-script 6.0.0 contain a consensus rule enforcement bypass caused by accepting V5 transparent inputs signed with SIGHASH\_SINGLE lacking corresponding outputs, letting attackers cause network consensus split, exploit requires crafted V5 transactions.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104435)

## Details

Type

Authentication Bypass

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-347](https://cwe.mitre.org/data/definitions/347.html)

## Vendor fix

Update to the latest version that enforces ZIP-244 consensus rules correctly.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104435](https://nvd.nist.gov/vuln/detail/CVE-2026-104435)
- [https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-pvmv-cwg8-v6c8](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-pvmv-cwg8-v6c8)
- [https://www.vulncheck.com/advisories/zebra-4.4.0-consensus-divergence-via-v5-sighash-single-without-output](https://www.vulncheck.com/advisories/zebra-4.4.0-consensus-divergence-via-v5-sighash-single-without-output)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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