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CVE-2026-39821

🗓️ 22 May 2026 15:01:21Reported by GoType 
cve
 cve
🔗 web.nvd.nist.gov👁 666 Views

ToUnicode accepts punycode labels that decode to ASCII, enabling privilege escalation in the idna package.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
osv
OSV
MINI-4VQ7-J578-RMPJ
29 Jun 202610:30
osv
osv
OSV
MINI-4VRC-PG3H-Q82C
14 Aug 202614:39
osv
osv
OSV
MINI-4W23-Q8GV-XFRV
17 Aug 202607:32
osv
osv
OSV
MINI-4W3G-JJ6V-CPFM
4 Jun 202609:35
osv
osv
OSV
MINI-4WHP-QQ3V-645Q
5 Jun 202616:51
osv
osv
OSV
MINI-4WHW-F6WQ-337J
17 Aug 202601:30
osv
osv
OSV
MINI-4WJ3-GXHP-C7X3
5 Jun 202613:05
osv
osv
OSV
MINI-4X67-7HH3-PJ66
17 Aug 202601:30
osv
osv
OSV
MINI-4XFX-M868-V9F9
4 Jun 202612:22
osv
osv
OSV
MINI-4XMW-3GG6-VRPR
5 Jun 202616:52
osv
Rows per page
NVD
Node
golangnetRange<0.55.0go
[
  {
    "vendor": "Go standard library",
    "product": "net/http",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "net/http",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.25.13",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.26.0-0",
        "lessThan": "1.26.6",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.27.0-0",
        "lessThan": "1.27.0-rc.3",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "idnaASCII"
      },
      {
        "name": "Client.CloseIdleConnections"
      },
      {
        "name": "Client.Do"
      },
      {
        "name": "Client.Get"
      },
      {
        "name": "Client.Head"
      },
      {
        "name": "Client.Post"
      },
      {
        "name": "Client.PostForm"
      },
      {
        "name": "ClientConn.Close"
      },
      {
        "name": "ClientConn.RoundTrip"
      },
      {
        "name": "Get"
      },
      {
        "name": "Head"
      },
      {
        "name": "Post"
      },
      {
        "name": "PostForm"
      },
      {
        "name": "Transport.CloseIdleConnections"
      },
      {
        "name": "Transport.NewClientConn"
      },
      {
        "name": "Transport.RoundTrip"
      },
      {
        "name": "http1ClientConn.Close"
      },
      {
        "name": "http1ClientConn.RoundTrip"
      },
      {
        "name": "http2ClientConn.RoundTrip"
      },
      {
        "name": "http2RoundTripper.RoundTrip"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Go standard library",
    "product": "net/http/internal/http2",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "net/http/internal/http2",
    "versions": [
      {
        "version": "0",
        "lessThan": "1.25.13",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.26.0-0",
        "lessThan": "1.26.6",
        "status": "affected",
        "versionType": "semver"
      },
      {
        "version": "1.27.0-0",
        "lessThan": "1.27.0-rc.3",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "authorityAddr"
      },
      {
        "name": "Transport.AddConn"
      },
      {
        "name": "Transport.RoundTrip"
      },
      {
        "name": "Transport.RoundTripOpt"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "golang.org/x/net",
    "product": "golang.org/x/net/idna",
    "collectionURL": "https://pkg.go.dev",
    "packageName": "golang.org/x/net/idna",
    "versions": [
      {
        "version": "0",
        "lessThan": "0.55.0",
        "status": "affected",
        "versionType": "semver"
      }
    ],
    "programRoutines": [
      {
        "name": "Profile.process"
      },
      {
        "name": "Profile.ToASCII"
      },
      {
        "name": "Profile.ToUnicode"
      },
      {
        "name": "ToASCII"
      },
      {
        "name": "ToUnicode"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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21 Aug 2026 21:01Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.19.6
EPSS0.00655
SSVC
666