{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-32884", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-16T21:03:44.421Z", "datePublished": "2026-03-30T20:36:19.729Z", "dateUpdated": "2026-03-31T18:53:35.754Z"}, "containers": {"cna": {"title": "Botan: Case-Insensitive CN Values Bypass DNS excludedSubtrees Name Constraints (RFC 5280 Violation)", "problemTypes": [{"descriptions": [{"cweId": "CWE-295", "lang": "en", "description": "CWE-295: Improper Certificate Validation", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5"}], "affected": [{"vendor": "randombit", "product": "botan", "versions": [{"version": "< 3.11.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-30T20:36:19.729Z"}, "descriptions": [{"lang": "en", "value": "Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0."}], "source": {"advisory": "GHSA-7c3g-7763-ggj5", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-31T18:50:34.432173Z", "id": "CVE-2026-32884", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-31T18:53:35.754Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0."}, {"lang": "es", "value": "Botan es una biblioteca de criptograf\u00eda C++. Antes de la versi\u00f3n 3.11.0, durante el procesamiento de una ruta de certificado X.509 utilizando restricciones de nombre que restringen el conjunto de nombres DNS permitidos, si no se define un nombre alternativo del sujeto en el certificado de entidad final, Botan verificar\u00eda que el CN estaba permitido por las restricciones de nombre DNS, aunque esta verificaci\u00f3n t\u00e9cnicamente no es requerida por el RFC 5280. Sin embargo, esta verificaci\u00f3n no tuvo en cuenta la posibilidad de un CN con may\u00fasculas y min\u00fasculas. As\u00ed, un certificado con CN=Sub.EVIL.COM y sin nombre alternativo del sujeto eludir\u00eda una restricci\u00f3n de excludedSubtrees para evil.com porque la comparaci\u00f3n distingue entre may\u00fasculas y min\u00fasculas. Este problema ha sido parcheado en la versi\u00f3n 3.11.0."}], "id": "CVE-2026-32884", "lastModified": "2026-04-01T14:24:02.583", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-30T21:17:10.093", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.11.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "botan", "source": "cna", "vendor": "randombit"}, "product": "botan", "vendor": "randombit"}], "analysis": {"en": {"generated_at": "2026-03-31T05:39:09.905730+00:00", "value": {"mitigation_remediation": ["Upgrade to Botan version 3.11.0 or later", "If immediate upgrade is not possible, modify or supplement validation logic to enforce case\u2011insensitive CN checks or require a Subject Alternative Name", "Maintain up\u2011to\u2011date dependencies and monitor for related advisories"], "summary": {"action": "Immediate Patch", "impact": "Bypasses name constraints in X.509 certificate validation"}, "threat_synthesis": {"affected_systems": "This issue affects the Randombit Botan C++ cryptography library in all releases prior to version 3.11.0. Software that incorporates Botan without upgrading may be vulnerable if it validates X.509 certificates with name constraints.", "description_and_impact": "A flaw in Botan's handling of name constraints allows a certificate with a mixed\u2011case Common Name and no Subject Alternative Name to bypass DNS excludedSubtrees restrictions. The library performs a case\u2011sensitive comparison during path validation, which is incorrect per RFC 5280. Consequently, an attacker can issue a certificate that appears valid to the library while violating the intended name constraint policy, enabling potential impersonation or fraud.", "risk_and_exploitability": "The vulnerability carries a CVSS score of 5.9, indicating moderate severity. EPSS data is not available, and it is not listed in the CISA KEV catalog. The attack vector is inferred to be remote: an adversary can simply submit a specially crafted certificate to an application that performs certificate path validation using Botan. Because the flaw lies in the library's internal logic, no additional conditions are required beyond the presence of name constraints and a CN with mixed case."}}}}, "created": "2026-03-31T19:59:52.634502+00:00", "updated": "2026-03-31T20:40:05.885259+00:00", "vendors": ["randombit", "randombit$PRODUCT$botan"]}