ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling_CVE-2026-41583

{
    "lastseen": "",
    "description": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.1 and prior to zebra-script version 5.0.2, after a refactoring, Zebra failed to validate a consensus rule that restricted the possible values of sighash hash types for V5 transactions which were enabled in the NU5 network upgrade. Zebra nodes could thus accept and eventually mine a block that would be considered invalid by zcashd nodes, creating a consensus split between Zebra and zcashd nodes. In a similar vein, for V4 transactions, Zebra mistakenly used the \"canonical\" hash type when computing the sighash while zcashd (correctly per the spec) uses the raw value, which could also crate a consensus split. This issue has been patched in zebrad version 4.3.1 and zebra-script version 5.0.2.",
    "published": "2026-05-08T14:55:50.120Z",
    "modified": "2026-05-08T14:55:50.120Z",
    "type": "cve",
    "title": "ZEBRA: Consensus Divergence in Transparent Sighash Hash-Type Handling",
    "source": "GitHub_M",
    "references": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-8m29-fpq5-89jj",
    "id": "CVE-2026-41583",
    "bulletinFamily": "",
    "cwe": [
        "CWE-573"
    ],
    "cvelist": null,
    "sourceData": "ZcashFoundation zebra zebrad < 4.3.1\nZcashFoundation zebra zebra-script < 5.0.2",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zebra",
    "version": "zebrad < 4.3.1",
    "vendor": "ZcashFoundation",
    "ai_description": "Consensus divergence in transparent sighash hash-type handling due to incorrect validation of consensus rules, potentially leading to a consensus split between Zebra and zcashd nodes.",
    "ai_severity": "Critical",
    "ai_vendor": "ZcashFoundation",
    "ai_product": "zebra",
    "ai_version": "zebrad < 4.3.1, zebra-script < 5.0.2",
    "ai_score": 9.3
}