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CVE-2026-34377

Zebra has a Consensus Failure due to Improper Verification of V5 Transactions

Published: Mar 31, 2026Updated: Jul 24, 2026 Sources: CVE List NVDCWE-347
8.1HIGH
NVD MITRE
EPSS Score
0.3%
Top 83.0%
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 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, 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 would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.

No summary for this CVE yet.

CVSS Vector Breakdown

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

CWE-347

Affected Products

ZcashFoundation
oss-project
zebraOn-prem
OSS Libraries
zebra-consensusOn-prem
OSS Libraries
zfnd
aka zebrad, zebra-chain, zebra
zebraMixed
OSS Libraries / generic-library
zebra-consensusMixed
OSS Libraries / generic-library

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh
github.com
https://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0
github.com
https://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements
zfnd.org

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