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CVE-2026-39821

🗓️ 22 May 2026 15:01:21Reported by GoType 
cve
 cve
🔗 web.nvd.nist.gov👁 773 Views

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

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
osv
OSV
CGA-533J-5H63-F5PC
4 Jun 202612:30
osv
osv
OSV
CGA-533V-FQR3-QF6G
14 Aug 202614:07
osv
osv
OSV
CGA-536H-J863-WR5C
4 Jun 202611:50
osv
osv
OSV
CGA-5384-4MGM-FMP2
4 Jun 202609:11
osv
osv
OSV
CGA-5386-QRXQ-PHH3
14 Aug 202614:29
osv
osv
OSV
CGA-538W-6C27-FWWF
14 Aug 202613:25
osv
osv
OSV
CGA-53C7-3WFF-55RG
4 Jun 202613:39
osv
osv
OSV
CGA-53F3-W6PG-6JJM
14 Aug 202612:57
osv
osv
OSV
CGA-53F6-J6GX-6228
14 Aug 202613:07
osv
osv
OSV
CGA-53H5-7838-HGVC
14 Aug 202613:16
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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11 Sep 2026 13:17Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.19.6
EPSS0.00692
SSVC
773