{"api_version":"1","generated_at":"2026-07-23T19:39:26+00:00","cve":"CVE-2026-43820","urls":{"html":"https://cve.report/CVE-2026-43820","api":"https://cve.report/api/cve/CVE-2026-43820.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-43820","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-43820"},"summary":{"title":"CVE-2026-43820","description":"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.","state":"PUBLISHED","assigner":"apple","published_at":"2026-07-23 15:17:05","updated_at":"2026-07-23 15:28:05"},"problem_types":["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."],"metrics":[],"references":[{"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j","name":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j","refsource":"product-security@apple.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43820","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43820","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Apple","product":"swift-nio-ssl","version":"affected 2.37.2 custom","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"product":"swift-nio-ssl","vendor":"Apple","versions":[{"lessThan":"2.37.2","status":"affected","version":"0","versionType":"custom"}]}],"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."}],"problemTypes":[{"descriptions":[{"description":"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.","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-07-23T14:33:20.551Z","orgId":"286789f9-fbc2-4510-9f9a-43facdede74c","shortName":"apple"},"references":[{"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"}]}},"cveMetadata":{"assignerOrgId":"286789f9-fbc2-4510-9f9a-43facdede74c","assignerShortName":"apple","cveId":"CVE-2026-43820","datePublished":"2026-07-23T14:33:20.551Z","dateReserved":"2026-05-01T22:46:27.822Z","dateUpdated":"2026-07-23T14:33:20.551Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-23 15:17:05","lastModifiedDate":"2026-07-23 15:28:05","problem_types":["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."],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"43820","Ordinal":"1","Title":"CVE-2026-43820","CVE":"CVE-2026-43820","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"43820","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"CVE-2026-43820"}]}}}