CVE-2026-40880

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, 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 vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-xvj8-ph7x-65gf	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:zfnd:zebra-consensus::::::rust::*
	cpe:2.3:a:zfnd:zebrad::::::rust::*

History

26 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) ZEBRA es un nodo de Zcash escrito completamente en Rust. Antes de la versión 4.3.1 de zebrad y la versión 5.0.2 de zebra-consensus, un error lógico en la caché de verificación de transacciones de Zebra podría permitir a un minero malicioso inducir una división de consenso. Al enviar cuidadosamente una transacción que es válida para la altura H+1 pero inválida para H+2 y luego minar esa transacción en un bloque a la altura H+2, un minero podría hacer que los nodos Zebra vulnerables aceptaran un bloque inválido, lo que llevaría a una división de consenso del resto de la red Zcash. Esta vulnerabilidad está corregida en la versión 4.3.1 de zebrad y la versión 5.0.2 de zebra-consensus.

Information

Published : 2026-04-21 20:17

Updated : 2026-10-26 21:10

NVD link : CVE-2026-40880

Mitre link : CVE-2026-40880

CVE.ORG link : CVE-2026-40880

JSON object : View

Products Affected

zfnd

zebrad
zebra-consensus

CWE

CWE-1025

Comparison Using Wrong Factors

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Prior to zebrad version 4.3.1 and zebra-consensus version 5.0.2, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By carefully submitting a transaction that is valid for height H+1 but invalid for H+2 and then mining that transaction in a block at height H+2, 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 vulnerability is fixed in zebrad version 4.3.1 and zebra-consensus version 5.0.2."}, {"lang": "es", "value": "ZEBRA es un nodo de Zcash escrito completamente en Rust. Antes de la versi\u00f3n 4.3.1 de zebrad y la versi\u00f3n 5.0.2 de zebra-consensus, un error l\u00f3gico en la cach\u00e9 de verificaci\u00f3n de transacciones de Zebra podr\u00eda permitir a un minero malicioso inducir una divisi\u00f3n de consenso. Al enviar cuidadosamente una transacci\u00f3n que es v\u00e1lida para la altura H+1 pero inv\u00e1lida para H+2 y luego minar esa transacci\u00f3n en un bloque a la altura H+2, un minero podr\u00eda hacer que los nodos Zebra vulnerables aceptaran un bloque inv\u00e1lido, lo que llevar\u00eda a una divisi\u00f3n de consenso del resto de la red Zcash. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 4.3.1 de zebrad y la versi\u00f3n 5.0.2 de zebra-consensus."}], "lastModified": "2026-10-26T21:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:zfnd:zebra-consensus:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "EA4CC734-BCB2-4864-A7CC-B5D093489379", "versionEndExcluding": "5.0.2"}, {"criteria": "cpe:2.3:a:zfnd:zebrad:*:*:*:*:*:rust:*:*", "vulnerable": true, "matchCriteriaId": "0D5F3C05-ECFC-43B1-9168-8E114125F6B7", "versionEndExcluding": "4.3.1"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}