CVE-2026-104430
HIGHDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Low risk: more likely to be exploited than 33% of all known CVEs.
References
Related Vulnerabilities
Other CWE-628 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2019-14844 | High | 7.5 | 4.4% | - | - |
| CVE-2019-7303 | High | 7.5 | 3.7% | - | Fix |
| CVE-2026-19349 | Critical | 9.8 | 0.8% | - | Fix |
| CVE-2026-94636 | Medium | 8.2 | 0.4% | - | - |
| CVE-2025-0325 | Medium | 4.3 | 0.4% | - | - |
| CVE-2026-25634 | High | 7.8 | 0.3% | - | Fix |
Common questions
How do I fix CVE-2026-104430?
No published fix for CVE-2026-104430 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-104430 being actively exploited?
Not that we know of. CVE-2026-104430 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.41% is the estimated probability that it will be exploited in the next 30 days. That is higher than 33% of all scored CVEs.
How severe is CVE-2026-104430?
CVE-2026-104430 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-02.