Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization_CVE-2026-33524

{
    "lastseen": "",
    "description": "Zserio is a framework for serializing structured data with a compact and efficient way with low overhead. Prior to 2.18.1, a crafted payload as small as 4-5 bytes can force memory allocations of up to 16 GB, crashing any process with an OOM error (Denial of Service). This vulnerability is fixed in 2.18.1.",
    "published": "2026-04-24T18:18:02.913Z",
    "modified": "2026-04-24T18:18:02.913Z",
    "type": "cve",
    "title": "Zserio: Integer Overflow in BitStreamReader and Unbounded Memory Allocation in Deserialization",
    "source": "GitHub_M",
    "references": "https://github.com/ndsev/zserio/security/advisories/GHSA-cwq5-8pvq-j65j",
    "id": "CVE-2026-33524",
    "bulletinFamily": "",
    "cwe": [
        "CWE-789"
    ],
    "cvelist": null,
    "sourceData": "ndsev zserio < 2.18.1",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zserio",
    "version": "< 2.18.1",
    "vendor": "ndsev",
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    "ai_score": 0
}