CVE-2026-104430
Zebra 4.5.0 Consensus Split via P2SH Sigop Overcount
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
Zebra zebrad 4.5.0 and zebra-script 7.0.0 count P2SH redeem script signature operations in legacy mode rather than zcashd's accurate P2SH mode, overcounting CHECKMULTISIG preceded by OP_1 through OP_16 as 20 sigops and causing a consensus divergence. Remote attackers can broadcast P2SH spends using low-threshold multisig redeem scripts so that a block zcashd accepts exceeds Zebra's inflated MAX_BLOCK_SIGOPS count, causing Zebra nodes to reject it and stall off the chain.
| CWE | CWE-628 |
| Vendor | zcashfoundation |
| Product | zebra |
| Published | Oct 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
ZcashFoundation / zebra
4.5.0 < 4.5.1
ZcashFoundation / zebra
7.0.0 < 7.0.1
References
Credits
🔍 sangsoo-osec