CVE-2026-104430

Zebra 4.5.0 Consensus Split via P2SH Sigop Overcount

State: Published
Severity: 8.7 High
Published: Oct 2, 2026
Updated: Oct 2, 2026
Reserved: Oct 2, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-628 Function Call with Incorrectly Specified Arguments

Affected Products

Product	Versions
zebraZcashFoundation	4.5.0 to before 4.5.1Affected 4.5.1Not affected
zebraZcashFoundation	7.0.0 to before 7.0.1Affected 7.0.1Not affected

References

GitHub Security Advisory (GHSA-2prc-cj5x-4443)vendor-advisory
VulnCheck Advisory: Zebra 4.5.0 Consensus Split via P2SH Sigop Overcountthird-party-advisory

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