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vuln-cve/data/2026/43xxx/CVE-2026-43820.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-43820",
"assignerOrgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
"state": "PUBLISHED",
"assignerShortName": "apple",
"dateReserved": "2026-05-01T22:46:27.822Z",
"datePublished": "2026-07-23T14:33:20.551Z",
"dateUpdated": "2026-07-24T20:09:49.866Z"
},
"containers": {
"cna": {
"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."
}
]
}
],
"affected": [
{
"vendor": "Apple",
"product": "swift-nio-ssl",
"versions": [
{
"version": "0",
"status": "affected",
"lessThan": "2.37.2",
"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."
}
],
"references": [
{
"url": "https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j"
}
],
"providerMetadata": {
"orgId": "286789f9-fbc2-4510-9f9a-43facdede74c",
"shortName": "apple",
"dateUpdated": "2026-07-23T14:33:20.551Z"
}
},
"adp": [
{
"problemTypes": [
{
"descriptions": [
{
"type": "CWE",
"cweId": "CWE-125",
"lang": "en",
"description": "CWE-125 Out-of-bounds Read"
}
]
}
],
"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"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-07-24T20:09:49.866Z"
}
}
]
}
}