ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops_CVE-2026-44498

{
    "lastseen": "",
    "description": "ZEBRA is a Zcash node written entirely in Rust. Prior to version 4.4.0, Zebra's block validator undercounts transparent signature operations against the 20000-sigop block limit (MAX_BLOCK_SIGOPS), allowing it to accept blocks that zcashd rejects with bad-blk-sigops. A miner who produces such a block can split the network: Zebra nodes follow the offending chain while zcashd nodes do not. This issue has been patched in version 4.4.0.",
    "published": "2026-05-08T15:09:09.919Z",
    "modified": "2026-05-08T15:09:09.919Z",
    "type": "cve",
    "title": "ZEBRA: Block Validator Undercounts Coinbase and P2SH Sigops",
    "source": "GitHub_M",
    "references": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jv4h-j224-23cc\nhttps://github.com/ZcashFoundation/zebra/releases/tag/v4.4.0",
    "id": "CVE-2026-44498",
    "bulletinFamily": "",
    "cwe": [
        "CWE-682"
    ],
    "cvelist": null,
    "sourceData": "ZcashFoundation zebra < 4.4.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.2,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zebra",
    "version": "< 4.4.0",
    "vendor": "ZcashFoundation",
    "ai_description": "Block validator undercounts transparent signature operations, allowing blocks to be accepted that zcashd rejects, potentially splitting the network.",
    "ai_severity": "Critical",
    "ai_vendor": "ZcashFoundation",
    "ai_product": "Zebra",
    "ai_version": "< 4.4.0",
    "ai_score": 9.2
}