{
"id": "GHSA-89gr-r52h-f8rx",
"aliases": [
"CVE-2026-39831"
],
"details": "The Verify() method for FIDO/U2F security key types ([email protected] , [email protected] ) 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.",
"summary": "golang.org/x/crypto: FIDO/U2F security key physical presence check can be bypassed",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.52.0"
}
]
}
],
"package": {
"name": "golang.org/x/crypto",
"ecosystem": "Go"
}
}
],
"modified": "2026-07-07T15:25:57Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"
}
],
"published": "2026-06-25T22:21:12Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39831",
"type": "ADVISORY"
},
{
"url": "https://cs.opensource.google/go/x/crypto",
"type": "PACKAGE"
},
{
"url": "https://go.dev/cl/781662",
"type": "WEB"
},
{
"url": "https://go.dev/issue/79566",
"type": "WEB"
},
{
"url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI",
"type": "WEB"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-5019",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-862"
],
"severity": "CRITICAL",
"github_reviewed": true,
"nvd_published_at": "2026-05-22T04:16:22Z",
"github_reviewed_at": "2026-06-25T22:21:12Z"
}
}