ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)_CVE-2025-66567

{
    "lastseen": "",
    "description": "The ruby-saml library is for implementing the client side of a SAML authorization. ruby-saml versions up to and including 1.12.4 contain an authentication bypass vulnerability due to an incomplete fix for CVE-2025-25292. ReXML and Nokogiri parse XML differently, generating entirely different document structures from the same input. This allows an attacker to execute a Signature Wrapping attack. This issue is fixed in version 1.18.0.",
    "published": "2025-12-09T01:55:06.296Z",
    "modified": "2025-12-09T01:55:06.296Z",
    "type": "cve",
    "title": "ruby-saml has a SAML authentication bypass due to namespace handling (parser differential)",
    "source": "GitHub_M",
    "references": "https://github.com/SAML-Toolkits/ruby-saml/security/advisories/GHSA-9v8j-x534-2fx3\nhttps://github.com/SAML-Toolkits/ruby-saml/commit/e9c1cdbd0f9afa467b585de279db0cbd0fb8ae97\nhttps://github.com/advisories/GHSA-754f-8gm6-c4r2",
    "id": "CVE-2025-66567",
    "bulletinFamily": "",
    "cwe": [
        "CWE-347"
    ],
    "cvelist": null,
    "sourceData": "SAML-Toolkits ruby-saml < 1.18.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/SC:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "ruby-saml",
    "version": "< 1.18.0",
    "vendor": "SAML-Toolkits",
    "ai_description": "Authentication bypass vulnerability in ruby-saml due to incomplete fix for CVE-2025-25292, allowing Signature Wrapping attack",
    "ai_severity": "Critical",
    "ai_vendor": "SAML-Toolkits",
    "ai_product": "ruby-saml",
    "ai_version": "< 1.18.0",
    "ai_score": 9.3
}