UBUNTU-CVE-2026-5121

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Source
https://ubuntu.com/security/CVE-2026-5121
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5121
Upstream
  • CVE-2026-5121
Downstream
Related
Published
2026-03-30T08:16:00Z
Modified
2026-05-21T19:46:31.529381452Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

References

Affected packages

Ubuntu:22.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.6.0-1ubuntu1.7

Affected versions

3.*
3.4.3-2
3.4.3-2build1
3.5.2-1
3.5.2-1ubuntu1
3.6.0-1ubuntu1
3.6.0-1ubuntu1.1
3.6.0-1ubuntu1.2
3.6.0-1ubuntu1.3
3.6.0-1ubuntu1.4
3.6.0-1ubuntu1.5
3.6.0-1ubuntu1.6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.6.0-1ubuntu1.7",
            "binary_name": "libarchive-tools"
        },
        {
            "binary_version": "3.6.0-1ubuntu1.7",
            "binary_name": "libarchive13"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:24.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.7.2-2ubuntu0.7

Affected versions

3.*
3.6.2-1ubuntu1
3.7.2-1ubuntu1
3.7.2-1ubuntu2
3.7.2-1.1ubuntu2
3.7.2-2
3.7.2-2ubuntu0.1
3.7.2-2ubuntu0.2
3.7.2-2ubuntu0.3
3.7.2-2ubuntu0.4
3.7.2-2ubuntu0.5
3.7.2-2ubuntu0.6

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.7.2-2ubuntu0.7",
            "binary_name": "libarchive-tools"
        },
        {
            "binary_version": "3.7.2-2ubuntu0.7",
            "binary_name": "libarchive13t64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:25.10
libarchive

Package

Name
libarchive
Purl
pkg:deb/ubuntu/libarchive?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.7.7-0ubuntu3.2

Affected versions

3.*
3.7.7-0ubuntu2
3.7.7-0ubuntu2.1
3.7.7-0ubuntu2.2
3.7.7-0ubuntu3
3.7.7-0ubuntu3.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "3.7.7-0ubuntu3.2",
            "binary_name": "libarchive-tools"
        },
        {
            "binary_version": "3.7.7-0ubuntu3.2",
            "binary_name": "libarchive13t64"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:26.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.8.5-1ubuntu2.1

Affected versions

3.*
3.7.7-0ubuntu3
3.8.5-1ubuntu1
3.8.5-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.8.5-1ubuntu2.1",
            "binary_name": "libarchive-tools"
        },
        {
            "binary_version": "3.8.5-1ubuntu2.1",
            "binary_name": "libarchive13t64"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:Pro:14.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.1.2-7ubuntu2.8+esm5

Affected versions

3.*
3.1.2-5ubuntu1
3.1.2-7ubuntu1
3.1.2-7ubuntu2
3.1.2-7ubuntu2.1
3.1.2-7ubuntu2.2
3.1.2-7ubuntu2.3
3.1.2-7ubuntu2.4
3.1.2-7ubuntu2.6
3.1.2-7ubuntu2.7
3.1.2-7ubuntu2.8
3.1.2-7ubuntu2.8+esm1
3.1.2-7ubuntu2.8+esm3
3.1.2-7ubuntu2.8+esm4

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "3.1.2-7ubuntu2.8+esm5",
            "binary_name": "bsdcpio"
        },
        {
            "binary_version": "3.1.2-7ubuntu2.8+esm5",
            "binary_name": "bsdtar"
        },
        {
            "binary_version": "3.1.2-7ubuntu2.8+esm5",
            "binary_name": "libarchive13"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:Pro:16.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.1.2-11ubuntu0.16.04.8+esm3

Affected versions

3.*
3.1.2-11build1
3.1.2-11ubuntu0.16.04.1
3.1.2-11ubuntu0.16.04.2
3.1.2-11ubuntu0.16.04.3
3.1.2-11ubuntu0.16.04.4
3.1.2-11ubuntu0.16.04.5
3.1.2-11ubuntu0.16.04.6
3.1.2-11ubuntu0.16.04.7
3.1.2-11ubuntu0.16.04.8
3.1.2-11ubuntu0.16.04.8+esm1
3.1.2-11ubuntu0.16.04.8+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.1.2-11ubuntu0.16.04.8+esm3",
            "binary_name": "bsdcpio"
        },
        {
            "binary_version": "3.1.2-11ubuntu0.16.04.8+esm3",
            "binary_name": "bsdtar"
        },
        {
            "binary_version": "3.1.2-11ubuntu0.16.04.8+esm3",
            "binary_name": "libarchive13"
        }
    ],
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:Pro:18.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.2.2-3.1ubuntu0.7+esm3

Affected versions

3.*
3.2.2-3.1
3.2.2-3.1ubuntu0.1
3.2.2-3.1ubuntu0.2
3.2.2-3.1ubuntu0.3
3.2.2-3.1ubuntu0.4
3.2.2-3.1ubuntu0.5
3.2.2-3.1ubuntu0.6
3.2.2-3.1ubuntu0.7
3.2.2-3.1ubuntu0.7+esm1
3.2.2-3.1ubuntu0.7+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.2.2-3.1ubuntu0.7+esm3",
            "binary_name": "bsdcpio"
        },
        {
            "binary_version": "3.2.2-3.1ubuntu0.7+esm3",
            "binary_name": "bsdtar"
        },
        {
            "binary_version": "3.2.2-3.1ubuntu0.7+esm3",
            "binary_name": "libarchive-tools"
        },
        {
            "binary_version": "3.2.2-3.1ubuntu0.7+esm3",
            "binary_name": "libarchive13"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"
Ubuntu:Pro:20.04:LTS
libarchive

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.4.0-2ubuntu1.5+esm2

Affected versions

3.*
3.4.0-1
3.4.0-1build1
3.4.0-1ubuntu2
3.4.0-2ubuntu1
3.4.0-2ubuntu1.1
3.4.0-2ubuntu1.2
3.4.0-2ubuntu1.3
3.4.0-2ubuntu1.4
3.4.0-2ubuntu1.5
3.4.0-2ubuntu1.5+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "3.4.0-2ubuntu1.5+esm2",
            "binary_name": "libarchive-tools"
        },
        {
            "binary_version": "3.4.0-2ubuntu1.5+esm2",
            "binary_name": "libarchive13"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5121.json"