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vuln-cve/data/2026/39xxx/CVE-2026-39831.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-39831",
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"state": "PUBLISHED",
"assignerShortName": "Go",
"dateReserved": "2026-04-07T18:13:03.528Z",
"datePublished": "2026-05-22T02:31:27.436Z",
"dateUpdated": "2026-05-22T18:52:08.344Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go",
"dateUpdated": "2026-05-22T02:31:27.436Z"
},
"title": "Invoking bypass of FIDO/U2F security keys physical interaction in golang.org/x/crypto/ssh",
"descriptions": [
{
"lang": "en",
"value": "The Verify() method for FIDO/U2F security key types (sk-ecdsa-sha2-nistp256@openssh.com, sk-ssh-ed25519@openssh.com) did not check the User Presence flag. Signatures generated without physical touch were accepted, allowing unattended use of a hardware security key. To restore the previous behavior, return a \"no-touch-required\" extension in Permissions.Extensions from PublicKeyCallback."
}
],
"affected": [
{
"vendor": "golang.org/x/crypto",
"product": "golang.org/x/crypto/ssh",
"collectionURL": "https://pkg.go.dev",
"packageName": "golang.org/x/crypto/ssh",
"versions": [
{
"version": "0",
"lessThan": "0.52.0",
"status": "affected",
"versionType": "semver"
}
],
"programRoutines": [
{
"name": "CertChecker.CheckCert"
},
{
"name": "skECDSAPublicKey.Verify"
},
{
"name": "skEd25519PublicKey.Verify"
},
{
"name": "connection.serverAuthenticate"
},
{
"name": "CertChecker.Authenticate"
},
{
"name": "CertChecker.CheckHostKey"
},
{
"name": "Certificate.Verify"
},
{
"name": "Dial"
},
{
"name": "NewClientConn"
},
{
"name": "NewServerConn"
}
],
"defaultStatus": "unaffected"
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-290: Authentication Bypass by Spoofing"
}
]
}
],
"references": [
{
"url": "https://go.dev/issue/79566"
},
{
"url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI"
},
{
"url": "https://go.dev/cl/781662"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5019"
}
],
"credits": [
{
"lang": "en",
"value": "NCC Group Cryptography Services, sponsored by Teleport"
}
]
},
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 9.1,
"attackVector": "NETWORK",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
}
},
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-05-22T18:51:41.233749Z",
"id": "CVE-2026-39831",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-05-22T18:52:08.344Z"
}
}
]
}
}