Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters_CVE-2025-59830

{
    "lastseen": "",
    "description": "Rack is a modular Ruby web server interface. Prior to version 2.2.18, Rack::QueryParser enforces its params_limit only for parameters separated by &, while still splitting on both & and ;. As a result, attackers could use ; separators to bypass the parameter count limit and submit more parameters than intended. Applications or middleware that directly invoke Rack::QueryParser with its default configuration (no explicit delimiter) could be exposed to increased CPU and memory consumption. This can be abused as a limited denial-of-service vector. This issue has been patched in version 2.2.18.",
    "published": "2025-09-25T14:37:06.967Z",
    "modified": "2025-09-25T14:37:06.967Z",
    "type": "cve",
    "title": "Rack QueryParser has an unsafe default allowing params_limit bypass via semicolon-separated parameters",
    "source": "GitHub_M",
    "references": "https://github.com/rack/rack/security/advisories/GHSA-625h-95r8-8xpm\nhttps://github.com/rack/rack/commit/54e4ffdd5affebcb0c015cc6ae74635c0831ed71",
    "id": "CVE-2025-59830",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400",
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "rack rack < 2.2.18",
    "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": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "rack",
    "version": "< 2.2.18",
    "vendor": "rack",
    "ai_description": "",
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    "ai_score": 0
}