PKIX draft CompositeVerifier accepts empty signature sequence as valid._CVE-2026-5588

{
    "lastseen": "",
    "description": ": Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules).\n\n\nPKIX draft CompositeVerifier accepts empty signature sequence as valid.\n\n\nThis issue affects BC-JAVA: from 1.49 before 1.84.",
    "published": "2026-04-15T09:06:15.617Z",
    "modified": "2026-04-15T09:06:15.617Z",
    "type": "cve",
    "title": "PKIX draft CompositeVerifier accepts empty signature sequence as valid.",
    "source": "bcorg",
    "references": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588",
    "id": "CVE-2026-5588",
    "bulletinFamily": "",
    "cwe": [
        "CWE-327"
    ],
    "cvelist": null,
    "sourceData": "Legion of the Bouncy Castle Inc. BC-JAVA 1.49",
    "sourceHref": "",
    "cvss": {
        "score": 10,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/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": "BC-JAVA",
    "version": "1.49",
    "vendor": "Legion of the Bouncy Castle Inc.",
    "ai_description": "Use of a Broken or Risky Cryptographic Algorithm vulnerability in BC-JAVA bcpkix, allowing PKIX draft CompositeVerifier to accept empty signature sequence as valid.",
    "ai_severity": "Critical",
    "ai_vendor": "Legion of the Bouncy Castle Inc.",
    "ai_product": "BC-JAVA",
    "ai_version": "1.49 to 1.84",
    "ai_score": 10
}