Zebra has a Consensus Failure due to Improper Verification of V5 Transactions_CVE-2026-34377

{
    "lastseen": "",
    "description": "ZEBRA is a Zcash node written entirely in Rust. Prior to zebrad version 4.3.0 and zebra-consensus version 5.0.1, a logic error in Zebra's transaction verification cache could allow a malicious miner to induce a consensus split. By matching a valid transaction's txid while providing invalid authorization data, a miner could cause vulnerable Zebra nodes to accept an invalid block, leading to a consensus split from the rest of the Zcash network. This would not allow invalid transactions to be accepted but could result in a consensus split between vulnerable Zebra nodes and invulnerable Zebra and Zcashd nodes. This issue has been patched in zebrad version 4.3.0 and zebra-consensus version 5.0.1.",
    "published": "2026-03-31T14:05:59.959Z",
    "modified": "2026-03-31T17:18:12.932Z",
    "type": "cve",
    "title": "Zebra has a Consensus Failure due to Improper Verification of V5 Transactions",
    "source": "GitHub_M",
    "references": "https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-3vmh-33xr-9cqh\nhttps://github.com/ZcashFoundation/zebra/releases/tag/v4.3.0\nhttps://zfnd.org/zebra-4-3-0-critical-security-fixes-zip-235-support-and-performance-improvements",
    "id": "CVE-2026-34377",
    "bulletinFamily": "",
    "cwe": [
        "CWE-347"
    ],
    "cvelist": null,
    "sourceData": "ZcashFoundation zebra < 4.3.0\nZcashFoundation zebra-consensus < 5.0.1",
    "sourceHref": "",
    "cvss": {
        "score": 8.4,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zebra",
    "version": "< 4.3.0",
    "vendor": "ZcashFoundation",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}