Netty: HTTP Request Smuggling due to incorrect chunk size parsing_CVE-2026-42580

{
    "lastseen": "",
    "description": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.",
    "published": "2026-05-13T18:04:03.690Z",
    "modified": "2026-05-13T18:04:03.690Z",
    "type": "cve",
    "title": "Netty: HTTP Request Smuggling due to incorrect chunk size parsing",
    "source": "GitHub_M",
    "references": "https://github.com/netty/netty/security/advisories/GHSA-m4cv-j2px-7723",
    "id": "CVE-2026-42580",
    "bulletinFamily": "",
    "cwe": [
        "CWE-444",
        "CWE-190"
    ],
    "cvelist": null,
    "sourceData": "netty netty >= 4.2.0.Alpha1, < 4.2.13.Final\nnetty netty < 4.1.133.Final\nio.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final\nio.netty netty-codec-http < 4.1.133.Final",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "netty",
    "version": ">= 4.2.0.Alpha1, < 4.2.13.Final",
    "vendor": "netty",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}