USN-8416-1

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Source
https://ubuntu.com/security/notices/USN-8416-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8416-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-8416-1
Upstream
Related
Published
2026-06-09T18:01:10Z
Modified
2026-06-10T01:29:12.280699044Z
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

Affected packages

Ubuntu:Pro:18.04:LTS / golang-golang-x-net-dev

Package

Name
golang-golang-x-net-dev
Purl
pkg:deb/ubuntu/golang-golang-x-net-dev?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:0.0+git20170629.c81e7f2+dfsg-2ubuntu0.1~esm3

Affected versions

1:0.*
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

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"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-39821",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:Pro:18.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8416-1.json"

Ubuntu:Pro:20.04:LTS / golang-golang-x-net-dev

Package

Name
golang-golang-x-net-dev
Purl
pkg:deb/ubuntu/golang-golang-x-net-dev?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3

Affected versions

1:0.*
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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3",
            "binary_name": "golang-go.net-dev"
        },
        {
            "binary_name": "golang-golang-x-net-dev",
            "binary_version": "1:0.0+git20190811.74dc4d7+dfsg-1ubuntu0.1~esm3"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2026-39821"
        }
    ],
    "ecosystem": "Ubuntu:Pro:20.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8416-1.json"