USN-8704-1

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Source
https://ubuntu.com/security/notices/USN-8704-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8704-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8704-1
Upstream
Related
Published
2026-08-31T13:12:09Z
Modified
2026-09-01T15:56:17.788690850Z
Summary
cpio vulnerabilities
Details

It was discovered that cpio incorrectly sanitized hard-link targets when extracting tar archives in copy-in mode. If a user or automated system were tricked into extracting a specially crafted tar archive, an attacker could possibly use this issue to create hard links to files outside the extraction directory, even when using the --no-absolute-filenames option. (CVE-2026-66484)

It was discovered that cpio did not properly bound the stack memory allocated for pathnames during archive extraction. If a user or automated system were tricked into extracting a specially crafted cpio archive, an attacker could possibly use this issue to cause cpio to crash, resulting in a denial of service. (CVE-2026-66485)

It was discovered that cpio did not properly escape archive member names when listing archive contents. If a user or automated system were tricked into listing a specially crafted archive, an attacker could possibly use this issue to inject misleading output or malicious terminal control sequences. (CVE-2026-66486)

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
Fixed
2.13+dfsg-7ubuntu0.2

Affected versions

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "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/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:22.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}
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
Fixed
2.15+dfsg-1ubuntu2.1

Affected versions

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.15+dfsg-1ubuntu2.1",
            "binary_name": "cpio"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:24.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}
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
Fixed
2.15+dfsg-2.1ubuntu0.1

Affected versions

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "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/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:26.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}
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
Fixed
2.11+dfsg-1ubuntu1.2+esm3

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "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/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:14.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}
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
Fixed
2.11+dfsg-5ubuntu1.1+esm2

Affected versions

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
    "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/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}
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
Fixed
2.12+dfsg-6ubuntu0.18.04.4+esm1

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}
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
Fixed
2.13+dfsg-2ubuntu0.4+esm1

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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/usn/USN-8704-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2026-66484",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "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"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66485",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-66486",
            "severity": [
                {
                    "type": "CVSS_V4",
                    "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}