UBUNTU-CVE-2026-126831

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Source
https://ubuntu.com/security/CVE-2026-126831
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-126831
Upstream
  • CVE-2026-126831
Published
2026-11-13T00:00:00Z
Modified
2026-11-13T21:05:35Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in cpio. A local user can cause a Denial of Service (DoS) by triggering a stack-based buffer overflow when creating archives in tar or ustar formats. When archiving files owned by users or groups with names exceeding 32 characters, cpio copies these names into fixed-size memory without verifying their length. This unbounded copy corrupts stack memory and causes the application to crash.

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
0 Unknown 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_name": "cpio",
            "binary_version": "2.13+dfsg-7ubuntu0.2"
        },
        {
            "binary_name": "cpio-win32",
            "binary_version": "2.13+dfsg-7ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.json"
Ubuntu:24.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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_name": "cpio",
            "binary_version": "2.15+dfsg-1ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.json"
Ubuntu:26.04:LTS
cpio

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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_name": "cpio",
            "binary_version": "2.15+dfsg-2.1ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.json"
Ubuntu:26.10
cpio

Package

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

Affected ranges

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

Affected versions

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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "cpio",
            "binary_version": "2.15+dfsg-2.1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.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
0 Unknown 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_name": "cpio",
            "binary_version": "2.11+dfsg-1ubuntu1.2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.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
0 Unknown 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_name": "cpio",
            "binary_version": "2.11+dfsg-5ubuntu1.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.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
0 Unknown 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_name": "cpio",
            "binary_version": "2.12+dfsg-6ubuntu0.18.04.4+esm1"
        },
        {
            "binary_name": "cpio-win32",
            "binary_version": "2.12+dfsg-6ubuntu0.18.04.4+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.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
0 Unknown 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_name": "cpio",
            "binary_version": "2.13+dfsg-2ubuntu0.4+esm1"
        },
        {
            "binary_name": "cpio-win32",
            "binary_version": "2.13+dfsg-2ubuntu0.4+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-126831.json"