USN-8521-1

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Source
https://ubuntu.com/security/notices/USN-8521-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8521-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8521-1
Upstream
Related
Published
2026-07-09T12:36:22Z
Modified
2026-07-09T21:44:27.112918483Z
Summary
libidn vulnerability
Details

It was discovered that Libidn incorrectly handled certain internationalized domain name strings. An attacker could possibly use this issue to obtain sensitive information or cause a denial of service.

References

Affected packages

Ubuntu:22.04:LTS / libidn

Package

Name
libidn
Purl
pkg:deb/ubuntu/libidn?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.38-4ubuntu1.1

Affected versions

1.*
1.33-3
1.33-3build1
1.38-4
1.38-4build1
1.38-4ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.38-4ubuntu1.1",
            "binary_name": "idn"
        },
        {
            "binary_version": "1.38-4ubuntu1.1",
            "binary_name": "libidn12"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-57053",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8521-1.json"

Ubuntu:24.04:LTS / libidn

Package

Name
libidn
Purl
pkg:deb/ubuntu/libidn?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.42-1ubuntu0.1

Affected versions

1.*
1.41-1
1.42-1
1.42-1build1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.42-1ubuntu0.1",
            "binary_name": "idn"
        },
        {
            "binary_version": "1.42-1ubuntu0.1",
            "binary_name": "libidn12"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-57053",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8521-1.json"

Ubuntu:26.04:LTS / libidn

Package

Name
libidn
Purl
pkg:deb/ubuntu/libidn?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.43-2ubuntu0.26.04.1

Affected versions

1.*
1.43-2
1.43-2build1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.43-2ubuntu0.26.04.1",
            "binary_name": "idn"
        },
        {
            "binary_version": "1.43-2ubuntu0.26.04.1",
            "binary_name": "libidn12"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-57053",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8521-1.json"