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CVE-2026-40880

Zebra: Cached Mempool Verification Bypasses Consensus Rules for Ahead-of-Tip Blocks

Published: Apr 21, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-1025
8.1HIGH
NVD MITRE
EPSS Score
0.3%
Top 82.3%
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 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.

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-1025

Affected Products

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

Exploitability

Official Patch Available
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References

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

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