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CVE-2026-41583

ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling

Published: May 8, 2026Updated: May 8, 2026 Sources: CVE List NVDCWE-573
9.1CRITICAL
NVD MITRE
EPSS Score
0.3%
Top 80.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-573

Affected Products

zfnd
aka zebra, zebrad, zebra-chain
zebra-scriptMixed
OSS Libraries / generic-library
zebradMixed
OSS Libraries / generic-library
ZcashFoundation
oss-project
zebraOn-prem
OSS Libraries

Exploitability

Official Patch Available
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References

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj
github.com

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