{"id":"CVE-2026-43820","state":"PUBLISHED","title":"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 al","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.","publishedAt":"2026-07-23T14:33:20.551Z","updatedAt":"2026-07-24T20:09:49.866Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","source":"CISA-ADP"},"assigner":"apple","products":["Apple swift-nio-ssl"],"affected":[{"vendor":"Apple","product":"swift-nio-ssl","versions":[{"version":"0","status":"affected","lessThan":"2.37.2","versionType":"custom"}]}],"references":["https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43820.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43820","state":"PUBLISHED","datePublished":"2026-07-23T14:33:20.551Z","dateUpdated":"2026-07-24T20:09:49.866Z","assignerShortName":"apple","assignerOrgId":"286789f9-fbc2-4510-9f9a-43facdede74c","dateReserved":"2026-05-01T22:46:27.822Z"},"containers":{"cna":{"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."}],"affected":[{"vendor":"Apple","product":"swift-nio-ssl","versions":[{"version":"0","status":"affected","lessThan":"2.37.2","versionType":"custom"}]}],"references":[{"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"}],"problemTypes":[{"descriptions":[{"lang":"en","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."}]}],"providerMetadata":{"shortName":"apple","orgId":"286789f9-fbc2-4510-9f9a-43facdede74c","dateUpdated":"2026-07-23T14:33:20.551Z"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j","tags":["exploit"]}],"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.7,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-24T20:09:17.611102Z","id":"CVE-2026-43820","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","type":"CWE","lang":"en","description":"CWE-125 Out-of-bounds Read"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-24T20:09:49.866Z"}}]}}}