CVE-2026-32884

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{"affected": [{"affectedData": [{"product": "botan", "vendor": "randombit", "versions": [{"status": "affected", "version": "< 3.11.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:botan_project:botan:*:*:*:*:*:*:*:*", "matchCriteriaId": "DBC9FF6C-805F-482E-9A45-8D1EC323BA96", "versionEndExcluding": "3.11.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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": "2026-06-17T10:36:30.417", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-32884", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-31T18:50:34.432173Z", "version": "2.0.3"}}]}, "published": "2026-03-30T21:17:10.093", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "Botan: Botan: Certificate validation bypass due to mixed-case Common Name in X.509 certificates", "id": "2453205", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453205"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-178", "details": ["A flaw was found in Botan, a C++ cryptography library. During the processing of X.509 certificate paths with DNS name constraints, the library incorrectly handles mixed-case Common Names (CN) in end-entity certificates that lack a Subject Alternative Name. A remote attacker could exploit this by crafting a malicious certificate with a mixed-case CN to bypass `excludedSubtrees` constraints. This vulnerability could lead to a certificate validation bypass, allowing an attacker to present a certificate that should have been rejected."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-32884", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "rust-sequoia-sq", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "rust-sequoia-sqv", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-03-30T20:36:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-32884\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-32884\nhttps://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5"], "threat_severity": "Moderate"}

{"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": "2026-04-13T16:37:00.933595+00:00", "value": {"mitigation_remediation": ["Apply Botan version 3.11.0 or later, which includes the fix for case\u2011insensitive CN handling", "Rebuild or update any software that links against the affected Botan library to ensure the patched version is used", "Consider disabling name\u2011constraint checks in the verification logic as a temporary mitigation if patching is not immediately possible, noting the increase in trusted domain exposure", "Monitor vendor advisories and security bulletins for any additional mitigations or workarounds"], "summary": {"action": "Immediate Patch", "impact": "Certificate trust bypass via DNS name constraint violation"}, "threat_synthesis": {"affected_systems": "The vulnerability affects randombit Botan cryptographic library versions prior to 3.11.0. Any software that links against these versions is vulnerable. No specific operating system or platform limits are identified beyond the use of the affected Botan library.", "description_and_impact": "Botan contains a flaw in its X.509 name constraint handling that allows a malicious certificate to bypass excluded DNS subtrees if the end\u2011entity certificate has no subject alternative name and the common name uses mixed\u2011case characters. This enables an attacker to forge a certificate that appears valid for a restricted domain while actually referencing an excluded domain, thereby compromising the integrity of certificate validation.", "risk_and_exploitability": "The CVSS score of 5.9 indicates moderate severity, while the EPSS score is below 1% suggesting a low likelihood of current exploitation. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires an attacker to generate or acquire a certificate chain containing a case\u2011variant CN without a subject alternative name and present it to a system performing X.509 validation with Botan. The flaw lies in certificate validation logic rather than code execution, so its impact is limited to trust bypass rather than arbitrary code execution. The attack vector is inferred to be through forged certificates and does not require additional software vulnerabilities."}}}}, "created": "2026-03-31T19:59:52.634502+00:00", "updated": "2026-04-14T16:42:32.489143+00:00", "vendors": ["randombit", "randombit$PRODUCT$botan"]}