{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5588", "assignerOrgId": "91579145-5d7b-4cc5-b925-a0262ff19630", "state": "PUBLISHED", "assignerShortName": "bcorg", "dateReserved": "2026-04-04T23:50:59.336Z", "datePublished": "2026-04-15T09:06:15.617Z", "dateUpdated": "2026-04-15T09:06:15.617Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "91579145-5d7b-4cc5-b925-a0262ff19630", "shortName": "bcorg", "dateUpdated": "2026-04-15T09:06:15.617Z"}, "title": "PKIX draft CompositeVerifier accepts empty signature sequence as valid.", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-327", "description": "CWE-327: Use of a Broken or Risky Cryptographic Algorithm", "type": "CWE"}]}], "affected": [{"vendor": "Legion of the Bouncy Castle Inc.", "product": "BC-JAVA", "platforms": ["all"], "collectionURL": "https://www.bouncycastle.org/download/bouncy-castle-java/", "packageName": "bcpkix", "repo": "https://github.com/bcgit/bc-java", "modules": ["pkix"], "versions": [{"status": "affected", "version": "1.49", "lessThan": "1.84", "versionType": "maven"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": ": 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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": ": Use of a Broken or Risky Cryptographic Algorithm vulnerability in Legion of the Bouncy Castle Inc. BC-JAVA bcpkix on all (pkix modules).<div><br></div><div>PKIX draft CompositeVerifier accepts empty signature sequence as valid.</div><div><br><p>This issue affects BC-JAVA: from 1.49 before 1.84.</p></div>"}]}], "references": [{"url": "https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%905588"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 10, "vectorString": "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"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.1"}}}}

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