{
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        "workarounds": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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      "credits": [
        {
          "lang": "en",
          "value": "KC1zs4 (https://github.com/KC1zs4)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\"."
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      "problemTypes": [
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          "descriptions": [
            {
              "description": "CWE-1289: Improper Validation of Unsafe Equivalence in Input",
              "lang": "en"
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      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:21.462Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
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        {
          "url": "https://go.dev/cl/767220"
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        {
          "url": "https://go.dev/issue/78760"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5026"
        }
      ],
      "title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna"
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    "assignerShortName": "Go",
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    "dateReserved": "2026-04-07T18:13:03.526Z",
    "dateUpdated": "2026-07-10T12:05:36.478Z",
    "state": "PUBLISHED"
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      "date": "2026-07-10",
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      "id": "msrc_CVE-2026-39821",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "50",
      "product_status:known_affected": "52",
      "product_status:known_not_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-39821.json",
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      "source": "Red Hat CSAF VEX",
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      "title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
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ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1289\", \"description\": \"Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-08T12:05:44.075Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 9.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-39821\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-23T03:55:58.522682Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1289\", \"description\": \"CWE-1289 Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-22T18:01:10.401Z\"}}], \"cna\": {\"title\": \"Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna\", \"credits\": [{\"lang\": \"en\", \"value\": \"KC1zs4 (https://github.com/KC1zs4)\"}], \"affected\": [{\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/idna\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.55.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/idna\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"Profile.process\"}, {\"name\": \"Profile.ToASCII\"}, {\"name\": \"Profile.ToUnicode\"}, {\"name\": \"ToASCII\"}, {\"name\": \"ToUnicode\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/767220\"}, {\"url\": \"https://go.dev/issue/78760\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5026\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\\\"xn--example-.com\\\") incorrectly returns the name \\\"example.com\\\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \\\"example.com\\\" but permit \\\"xn--example-.com\\\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \\\"example.com\\\".\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-1289: Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-22T15:01:21.462Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-39821\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-08T12:05:44.075Z\", \"dateReserved\": \"2026-04-07T18:13:03.526Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-05-22T15:01:21.462Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}