UBUNTU-CVE-2026-66484

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Source
https://ubuntu.com/security/CVE-2026-66484
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-66484
Upstream
  • CVE-2026-66484
Downstream
Published
2026-08-10T11:17:00Z
Modified
2026-08-31T17:16:59.048815816Z
Severity
  • 4.6 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

GNU cpio contains a Path Traversal vulnerability in its tar archive extraction functionality. When extracting a tar archive in copy-in mode with the --no-absolute-filenames option, the extracted file name is normalized but the tar hard-link target is passed to the linktoname function without equivalent sanitization before calling link function. A tar archive provided by an attacker, containing a hard-link entry whose linkname is set to an absolute path outside the extraction directory, can cause cpio to create a hard link to an existing file outside the intended extraction directory, breaking the expected guarantee of --no-absolute-filenames and allowing archive-controlled linkage to external files. This issue has been fixed in commit e2b9cbdd3354d2b1569b7390d1bc15c1930559ad

References

Affected packages

Ubuntu:22.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.13+dfsg-4ubuntu4
2.13+dfsg-7
2.13+dfsg-7ubuntu0.1
2.13+dfsg-7ubuntu0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.13+dfsg-7ubuntu0.2",
            "binary_name": "cpio"
        },
        {
            "binary_version": "2.13+dfsg-7ubuntu0.2",
            "binary_name": "cpio-win32"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"
Ubuntu:24.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.13+dfsg-7.1
2.14+dfsg-1
2.15+dfsg-1
2.15+dfsg-1ubuntu1
2.15+dfsg-1ubuntu2
2.15+dfsg-1ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.15+dfsg-1ubuntu2.1",
            "binary_name": "cpio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"
Ubuntu:26.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.15+dfsg-2ubuntu1
2.15+dfsg-2.1
2.15+dfsg-2.1ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.15+dfsg-2.1ubuntu0.1",
            "binary_name": "cpio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"
Ubuntu:Pro:14.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.11+dfsg-1ubuntu1
2.11+dfsg-1ubuntu1.1
2.11+dfsg-1ubuntu1.2
2.11+dfsg-1ubuntu1.2+esm1
2.11+dfsg-1ubuntu1.2+esm2
2.11+dfsg-1ubuntu1.2+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.11+dfsg-1ubuntu1.2+esm3",
            "binary_name": "cpio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"
Ubuntu:Pro:16.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.11+dfsg-4.1ubuntu1
2.11+dfsg-5ubuntu1
2.11+dfsg-5ubuntu1.1
2.11+dfsg-5ubuntu1.1+esm1
2.11+dfsg-5ubuntu1.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.11+dfsg-5ubuntu1.1+esm2",
            "binary_name": "cpio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"
Ubuntu:Pro:18.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.11+dfsg-6
2.12+dfsg-6
2.12+dfsg-6ubuntu0.18.04.1
2.12+dfsg-6ubuntu0.18.04.4
2.12+dfsg-6ubuntu0.18.04.4+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.12+dfsg-6ubuntu0.18.04.4+esm1",
            "binary_name": "cpio"
        },
        {
            "binary_version": "2.12+dfsg-6ubuntu0.18.04.4+esm1",
            "binary_name": "cpio-win32"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"
Ubuntu:Pro:20.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.12+dfsg-9
2.12+dfsg-9ubuntu1
2.13+dfsg-1
2.13+dfsg-2
2.13+dfsg-2ubuntu0.3
2.13+dfsg-2ubuntu0.4
2.13+dfsg-2ubuntu0.4+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.13+dfsg-2ubuntu0.4+esm1",
            "binary_name": "cpio"
        },
        {
            "binary_version": "2.13+dfsg-2ubuntu0.4+esm1",
            "binary_name": "cpio-win32"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-66484.json"