usn-8416-1
Vulnerability from osv_ubuntu
Published
2026-06-09 18:01
Modified
2026-06-30 15:55
Summary
golang-golang-x-net-dev vulnerability
Details

It was discovered that Go Networking incorrectly handled certain Punycode-encoded labels in the idna package. An attacker could possibly use this issue to bypass hostname-based access restrictions.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-39821",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "golang-go.net-dev",
            "binary_version": "1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3"
          },
          {
            "binary_name": "golang-golang-x-net-dev",
            "binary_version": "1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "golang-golang-x-net-dev",
        "purl": "pkg:deb/ubuntu/golang-golang-x-net-dev@1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.0+git20170629.c81e7f2+dfsg-1ubuntu1",
        "1:0.0+git20170629.c81e7f2+dfsg-1ubuntu2",
        "1:0.0+git20170629.c81e7f2+dfsg-2",
        "1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm1",
        "1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-39821",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "golang-go.net-dev",
            "binary_version": "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3"
          },
          {
            "binary_name": "golang-golang-x-net-dev",
            "binary_version": "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "golang-golang-x-net-dev",
        "purl": "pkg:deb/ubuntu/golang-golang-x-net-dev@1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:0.0+git20190811.74dc4d7+dfsg-1",
        "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm1",
        "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm2"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Go Networking incorrectly handled certain\nPunycode-encoded labels in the idna package. An attacker could possibly use\nthis issue to bypass hostname-based access restrictions.",
  "id": "USN-8416-1",
  "modified": "2026-06-30T15:55:21Z",
  "published": "2026-06-09T18:01:10Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8416-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39821"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "golang-golang-x-net-dev vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-39821"
  ]
}



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