CVE-2026-43820

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{"affected": [{"affectedData": [{"product": "swift-nio-ssl", "vendor": "Apple", "versions": [{"lessThan": "2.37.2", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "product-security@apple.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:apple:swiftnio_ssl:*:*:*:*:*:*:*:*", "matchCriteriaId": "1991D9E3-F794-4A75-85BA-07412FAC0886", "versionEndExcluding": "2.37.2", "versionStartIncluding": "2.18.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access. This vulnerability is addressed in swift-nio-ssl version 2.37.2."}, {"lang": "es", "value": "NIOSSLCertificate._subjectAlternativeNames proporciona acceso a los bytes sin procesar de los SAN de un certificado. NIOSSL proporciona acceso a un b\u00fafer que se asume que est\u00e1 respaldado por un ASN1_STRING, pero no todos los SAN est\u00e1n respaldados por un ASN1_STRING, por lo que acceder al b\u00fafer para dicho tipo puede llevar a un acceso a memoria fuera de l\u00edmites. Esta vulnerabilidad se aborda en swift-nio-ssl versi\u00f3n 2.37.2."}], "id": "CVE-2026-43820", "lastModified": "2026-10-24T13:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-43820", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-24T20:09:17.611102Z", "version": "2.0.3"}}]}, "published": "2026-07-23T15:17:05.503", "references": [{"source": "product-security@apple.com", "tags": ["Vendor Advisory", "Exploit"], "url": "https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Vendor Advisory", "Exploit"], "url": "https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"}], "sourceIdentifier": "product-security@apple.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

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