CVE-2026-41583

ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between Zebra and zcashd nodes. In a similar vein, for V4 transactions, Zebra mistakenly used the "canonical" hash type when computing the sighash while zcashd (correctly per the spec) uses the raw value, which could also crate a consensus split. This issue has been patched in zebrad version 4.3.1 and zebra-script version 5.0.2.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

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-8m29-fpq5-89jj	Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

08 May 2026, 18:44

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1
CPE		cpe:2.3:a:zfnd:zebra-script::::::rust::* cpe:2.3:a:zfnd:zebrad::::::rust::*
First Time		Zfnd zebra-script Zfnd zebrad Zfnd
References	~~() https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj -~~	() https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj - Vendor Advisory

08 May 2026, 15:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-08 15:16

Updated : 2026-05-08 18:44

NVD link : CVE-2026-41583

Mitre link : CVE-2026-41583

CVE.ORG link : CVE-2026-41583

JSON object : View

Products Affected

zfnd

zebrad
zebra-script

CWE

CWE-573

Improper Following of Specification by Caller

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