CVE-2026-39821 (GCVE-0-2026-39821)

Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-07-02 12:04
VLAI?
Title
Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
Summary
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".
Severity ?
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
Go
References
Impacted products
Vendor Product Version
golang.org/x/net golang.org/x/net/idna Affected: 0 , < 0.55.0 (semver)
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Credits
KC1zs4 (https://github.com/KC1zs4)
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            "value": "Made public."
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        "title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
        "workarounds": [
          {
            "lang": "en",
            "value": "Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds."
          }
        ],
        "x_adpType": "supplier",
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        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/idna",
          "product": "golang.org/x/net/idna",
          "programRoutines": [
            {
              "name": "Profile.process"
            },
            {
              "name": "Profile.ToASCII"
            },
            {
              "name": "Profile.ToUnicode"
            },
            {
              "name": "ToASCII"
            },
            {
              "name": "ToUnicode"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.55.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "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\"."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-1289: Improper Validation of Unsafe Equivalence in Input",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:21.462Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "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"
        }
      ],
      "title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-39821",
    "datePublished": "2026-05-22T15:01:21.462Z",
    "dateReserved": "2026-04-07T18:13:03.526Z",
    "dateUpdated": "2026-07-02T12:04:43.133Z",
    "state": "PUBLISHED"
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\"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:30855\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:30853\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:30854\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:30651\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26547\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:26546\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33531\", \"tags\": 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\"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:30650\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the `idna` package, specifically within the `golang.org/x/net/idna` component. This vulnerability allows for privilege escalation due to incorrect processing of Punycode-encoded labels. An attacker could craft a malicious Punycode label that, when initially checked, appears safe but then decodes to a restricted ASCII hostname, bypassing security controls and gaining unauthorized access.\"}], \"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\": \"2026-07-01T12:05:01.395Z\"}}, {\"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. 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      "cveMetadata": "{\"cveId\": \"CVE-2026-39821\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-01T12:05:01.395Z\", \"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"
    }
  }
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.