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vuln-cve/data/2026/42xxx/CVE-2026-42505.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-42505",
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"state": "PUBLISHED",
"assignerShortName": "Go",
"dateReserved": "2026-04-28T00:21:12.792Z",
"datePublished": "2026-07-08T15:46:33.407Z",
"dateUpdated": "2026-07-08T19:38:17.603Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go",
"dateUpdated": "2026-07-08T15:46:33.407Z"
},
"title": "Invoking Encrypted Client Hello privacy leak in crypto/tls",
"descriptions": [
{
"lang": "en",
"value": "Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello."
}
],
"affected": [
{
"vendor": "Go standard library",
"product": "crypto/tls",
"collectionURL": "https://pkg.go.dev",
"packageName": "crypto/tls",
"versions": [
{
"version": "0",
"lessThan": "1.25.12",
"status": "affected",
"versionType": "semver"
},
{
"version": "1.26.0-0",
"lessThan": "1.26.5",
"status": "affected",
"versionType": "semver"
},
{
"version": "1.27.0-0",
"lessThan": "1.27.0-rc.2",
"status": "affected",
"versionType": "semver"
}
],
"programRoutines": [
{
"name": "clientHelloMsg.marshalMsg"
},
{
"name": "Conn.Handshake"
},
{
"name": "Conn.HandshakeContext"
},
{
"name": "Conn.Read"
},
{
"name": "Conn.Write"
},
{
"name": "Dial"
},
{
"name": "DialWithDialer"
},
{
"name": "Dialer.Dial"
},
{
"name": "Dialer.DialContext"
},
{
"name": "QUICConn.HandleData"
},
{
"name": "QUICConn.SendSessionTicket"
},
{
"name": "QUICConn.Start"
}
],
"defaultStatus": "unaffected"
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-201: Insertion of Sensitive Information Into Sent Data"
}
]
}
],
"references": [
{
"url": "https://go.dev/cl/775960"
},
{
"url": "https://go.dev/issue/79282"
},
{
"url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5856"
}
],
"credits": [
{
"lang": "en",
"value": "Coia Prant (github.com/rbqvq)"
}
]
},
"adp": [
{
"problemTypes": [
{
"descriptions": [
{
"type": "CWE",
"cweId": "CWE-201",
"lang": "en",
"description": "CWE-201 Insertion of Sensitive Information Into Sent Data"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 5.3,
"attackVector": "NETWORK",
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "LOW"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-07-08T18:03:53.821942Z",
"id": "CVE-2026-42505",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"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": "2026-07-08T19:38:17.603Z"
}
}
]
}
}