USN-8362-1

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Source
https://ubuntu.com/security/notices/USN-8362-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8362-1
Upstream
Related
Published
2026-06-02T09:17:00Z
Modified
2026-06-02T14:14:25.491935661Z
Summary
xz-utils vulnerability
Details

It was discovered that XZ Utils did not properly manage memory when attempting to append data to a decoded index that contained no records. An attacker could possibly use this issue to cause XZ Utils to crash, resulting in a denial of service, or execute arbitrary code.

References

Affected packages

Ubuntu:22.04:LTS
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.2.5-2ubuntu1.1

Affected versions

5.*
5.2.5-2
5.2.5-2build1
5.2.5-2build2
5.2.5-2ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "5.2.5-2ubuntu1.1",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.2.5-2ubuntu1.1",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.2.5-2ubuntu1.1",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}
Ubuntu:24.04:LTS
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.6.1+really5.4.5-1ubuntu0.3

Affected versions

5.*
5.4.1-0.2
5.4.4-0.1
5.4.5-0.1
5.4.5-0.3
5.6.0-0.2
5.6.1+really5.4.5-1
5.6.1+really5.4.5-1build0.1
5.6.1+really5.4.5-1ubuntu0.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "5.6.1+really5.4.5-1ubuntu0.3",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.6.1+really5.4.5-1ubuntu0.3",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.6.1+really5.4.5-1ubuntu0.3",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:24.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}
Ubuntu:25.10
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.8.1-1ubuntu0.1

Affected versions

5.*
5.6.4-1ubuntu1
5.8.1-1
5.8.1-1build1
5.8.1-1build2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "5.8.1-1ubuntu0.1",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.8.1-1ubuntu0.1",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.8.1-1ubuntu0.1",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:25.10",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}
Ubuntu:Pro:14.04:LTS
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2

Affected versions

5.*
5.1.1alpha+20120614-2ubuntu1
5.1.1alpha+20120614-2ubuntu2
5.1.1alpha+20120614-2ubuntu2.14.04.1+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:14.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}
Ubuntu:Pro:16.04:LTS
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2

Affected versions

5.*
5.1.1alpha+20120614-2ubuntu2
5.1.1alpha+20120614-2ubuntu2.16.04.1+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}
Ubuntu:Pro:18.04:LTS
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.2.2-1.3ubuntu0.1+esm1

Affected versions

5.*
5.2.2-1.3
5.2.2-1.3ubuntu0.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "5.2.2-1.3ubuntu0.1+esm1",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.2.2-1.3ubuntu0.1+esm1",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.2.2-1.3ubuntu0.1+esm1",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}
Ubuntu:Pro:20.04:LTS
xz-utils

Package

Name
xz-utils
Purl
pkg:deb/ubuntu/xz-utils?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.2.4-1ubuntu1.1+esm1

Affected versions

5.*
5.2.4-1
5.2.4-1ubuntu1
5.2.4-1ubuntu1.1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "5.2.4-1ubuntu1.1+esm1",
            "binary_name": "liblzma5"
        },
        {
            "binary_version": "5.2.4-1ubuntu1.1+esm1",
            "binary_name": "xz-utils"
        },
        {
            "binary_version": "5.2.4-1ubuntu1.1+esm1",
            "binary_name": "xzdec"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8362-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-34743",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
                },
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "low"
                }
            ]
        }
    ]
}