{"id":"CVE-2026-43820","aliases":["EUVD-2026-48287","GHSA-xfxg-9975-pc2j"],"status":"published","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.","severity":{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00109,"percentile":0.0123,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2026-07-23T14:33:20Z","modified":"2026-10-26T02:30:18Z","products":[{"vendor":"apple","product":"swift-nio-ssl"},{"vendor":"apple","product":"swiftnio_ssl"}],"references":[{"url":"https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j","tags":["exploit","Vendor Advisory","Exploit","evidence"]}],"sources":{"cve":[{"id":"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.","status":"published","published":"2026-07-23T14:33:20.551Z","modified":"2026-07-24T20:09:49.866Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T13:37:36.275898Z"}],"euvd":[{"id":"EUVD-2026-48287","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.","status":"published","published":"2026-07-23T14:33:20Z","modified":"2026-07-24T20:09:49Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:19:38.612768Z"}],"nvd":[{"id":"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.","status":"published","published":"2026-07-23T15:17:05.503Z","modified":"2026-10-24T13:10:00.147Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:12:32.473901Z"}],"osv":[{"id":"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.","status":"published","published":"2026-07-23T15:17:05.503Z","modified":"2026-10-26T02:30:18.14775521Z","cvss":[{"version":"3.1","score":7.7,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:04.820169Z"}]}}