UBUNTU-CVE-2026-34743

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Source
https://ubuntu.com/security/CVE-2026-34743
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-34743
Upstream
Downstream
Related
Published
2026-04-02T19:21:00Z
Modified
2026-06-02T14:00:18Z
Severity
  • 1.7 (Low) CVSS_V4 - 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 CVSS Calculator
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.

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
0 Unknown 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_name": "liblzma5",
            "binary_version": "5.2.5-2ubuntu1.1"
        },
        {
            "binary_name": "xz-utils",
            "binary_version": "5.2.5-2ubuntu1.1"
        },
        {
            "binary_name": "xzdec",
            "binary_version": "5.2.5-2ubuntu1.1"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"
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
0 Unknown 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_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",
            "binary_version": "5.6.1+really5.4.5-1ubuntu0.3"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"
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
0 Unknown 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_name": "liblzma5",
            "binary_version": "5.8.1-1ubuntu0.1"
        },
        {
            "binary_name": "xz-utils",
            "binary_version": "5.8.1-1ubuntu0.1"
        },
        {
            "binary_name": "xzdec",
            "binary_version": "5.8.1-1ubuntu0.1"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"
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
0 Unknown 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_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",
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.14.04.1+esm2"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"
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
0 Unknown 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_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",
            "binary_version": "5.1.1alpha+20120614-2ubuntu2.16.04.1+esm2"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"
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
0 Unknown 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_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",
            "binary_version": "5.2.2-1.3ubuntu0.1+esm1"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"
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
0 Unknown 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_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",
            "binary_version": "5.2.4-1ubuntu1.1+esm1"
        }
    ],
    "priority_reason": "Issue not likely to affect any real-world applications"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34743.json"