USN-8883-1

It was discovered that the Go x/net/idna package incorrectly handled certain Punycode-encoded labels that decoded to ASCII-only labels. An attacker could possibly use this issue to bypass hostname-based access controls and escalate privileges.

References

Affected packages

Ubuntu:22.04:LTS / golang-1.18

Package

Name: golang-1.18
Purl: pkg:deb/ubuntu/golang-1.18?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.18.1-1ubuntu1.3

Affected versions

1.*

1.18~beta1-0ubuntu1

1.18~beta2-1ubuntu1

1.18~beta2-1ubuntu2

1.18~rc1-1ubuntu1

1.18-1ubuntu1

1.18.1-1ubuntu1

1.18.1-1ubuntu1.1

1.18.1-1ubuntu1.2

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "golang-1.18",
            "binary_version": "1.18.1-1ubuntu1.3"
        },
        {
            "binary_name": "golang-1.18-go",
            "binary_version": "1.18.1-1ubuntu1.3"
        },
        {
            "binary_name": "golang-1.18-src",
            "binary_version": "1.18.1-1ubuntu1.3"
        }
    ]
}

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": "high",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8883-1.json"

Ubuntu:22.04:LTS / golang-1.21

Package

Name: golang-1.21
Purl: pkg:deb/ubuntu/golang-1.21?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.21.1-1~ubuntu22.04.4

Affected versions

1.*

1.21.1-1~ubuntu22.04.1

1.21.1-1~ubuntu22.04.2

1.21.1-1~ubuntu22.04.3

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "golang-1.21",
            "binary_version": "1.21.1-1~ubuntu22.04.4"
        },
        {
            "binary_name": "golang-1.21-go",
            "binary_version": "1.21.1-1~ubuntu22.04.4"
        },
        {
            "binary_name": "golang-1.21-src",
            "binary_version": "1.21.1-1~ubuntu22.04.4"
        }
    ]
}

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": "high",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8883-1.json"

Ubuntu:22.04:LTS / golang-1.24

Package

Name: golang-1.24
Purl: pkg:deb/ubuntu/golang-1.24?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

1.24.13-2~22.04.2

Affected versions

1.*

1.24.4-1ubuntu1~22.04.1

1.24.4-1ubuntu1~22.04.2

1.24.13-2~22.04.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "golang-1.24",
            "binary_version": "1.24.13-2~22.04.2"
        },
        {
            "binary_name": "golang-1.24-go",
            "binary_version": "1.24.13-2~22.04.2"
        },
        {
            "binary_name": "golang-1.24-src",
            "binary_version": "1.24.13-2~22.04.2"
        }
    ]
}

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": "high",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8883-1.json"