USN-8456-1

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Source
https://ubuntu.com/security/notices/USN-8456-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8456-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8456-1
Upstream
Related
Published
2026-06-22T12:09:55Z
Modified
2026-07-15T19:45:55.452223449Z
Summary
libxml2 vulnerability
Details

Geoffrey Humphreys discovered that libxml2 had a use after free when parsing the internal subset of a DTD. A remote attacker could possibly use this issue to cause a denial of service or possibly execute arbitrary code.

References

Affected packages

Ubuntu:22.04:LTS / libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.13+dfsg-1ubuntu0.12

Affected versions

2.*
2.9.12+dfsg-4
2.9.12+dfsg-5
2.9.12+dfsg-6
2.9.13+dfsg-1
2.9.13+dfsg-1build1
2.9.13+dfsg-1ubuntu0.1
2.9.13+dfsg-1ubuntu0.2
2.9.13+dfsg-1ubuntu0.3
2.9.13+dfsg-1ubuntu0.4
2.9.13+dfsg-1ubuntu0.5
2.9.13+dfsg-1ubuntu0.6
2.9.13+dfsg-1ubuntu0.7
2.9.13+dfsg-1ubuntu0.8
2.9.13+dfsg-1ubuntu0.9
2.9.13+dfsg-1ubuntu0.10
2.9.13+dfsg-1ubuntu0.11

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.13+dfsg-1ubuntu0.12"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-6653"
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8456-1.json"

Ubuntu:24.04:LTS / libxml2

Package

Name
libxml2
Purl
pkg:deb/ubuntu/libxml2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.9.14+dfsg-1.3ubuntu3.8

Affected versions

2.*
2.9.14+dfsg-1.3
2.9.14+dfsg-1.3build1
2.9.14+dfsg-1.3build2
2.9.14+dfsg-1.3build3
2.9.14+dfsg-1.3ubuntu1
2.9.14+dfsg-1.3ubuntu2
2.9.14+dfsg-1.3ubuntu3
2.9.14+dfsg-1.3ubuntu3.1
2.9.14+dfsg-1.3ubuntu3.2
2.9.14+dfsg-1.3ubuntu3.3
2.9.14+dfsg-1.3ubuntu3.4
2.9.14+dfsg-1.3ubuntu3.5
2.9.14+dfsg-1.3ubuntu3.6
2.9.14+dfsg-1.3ubuntu3.7

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
        },
        {
            "binary_name": "libxml2-utils",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
        },
        {
            "binary_name": "python3-libxml2",
            "binary_version": "2.9.14+dfsg-1.3ubuntu3.8"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:P",
                    "type": "CVSS_V4"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2026-6653"
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8456-1.json"