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            "url": "https://access.redhat.com/errata/RHSA-2026:23262"
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            "url": "https://access.redhat.com/errata/RHSA-2026:23264"
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        ],
        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:30855: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34357: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30853: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30854: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34359: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34342: Cluster Observability Operator 1.5.0"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34364: Logging Subsystem for Red Hat OpenShift 6.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30651: Red Hat Advanced Cluster Management for Kubernetes 2.13"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26547: Red Hat Advanced Cluster Security for Kubernetes 4.10"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26546: Red Hat Advanced Cluster Security for Kubernetes 4.9"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33531: Red Hat Enterprise Linux AI 3.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33524: Red Hat Enterprise Linux AI 3.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:23262: Red Hat Hardened Images"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:23264: Red Hat Hardened Images"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33155: Red Hat OpenShift Service Mesh 2.6"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33160: Red Hat OpenShift Service Mesh 3.0"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33163: Red Hat OpenShift Service Mesh 3.1"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33173: Red Hat OpenShift Service Mesh 3.2"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33183: Red Hat OpenShift Service Mesh 3.3"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30650: multicluster engine for Kubernetes 2.8"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-05-22T16:00:52.844Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-22T15:01:21.462Z",
            "value": "Made public."
          }
        ],
        "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",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}