UBUNTU-CVE-2026-56392

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Source
https://ubuntu.com/security/CVE-2026-56392
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-56392
Upstream
Published
2026-07-24T09:16:00Z
Modified
2026-07-29T07:59:16Z
Severity
  • 1.8 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write. When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout. This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d

References

Affected packages

Ubuntu:14.04:LTS
coreutils

Package

Name
coreutils
Purl
pkg:deb/ubuntu/coreutils?arch=source&distro=trusty

Affected ranges

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

Affected versions

8.*
8.20-3ubuntu5
8.21-1ubuntu3
8.21-1ubuntu4
8.21-1ubuntu5
8.21-1ubuntu5.1
8.21-1ubuntu5.3
8.21-1ubuntu5.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.21-1ubuntu5.4",
            "binary_name": "coreutils"
        },
        {
            "binary_version": "8.21-1ubuntu5.4",
            "binary_name": "mktemp"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"
Ubuntu:16.04:LTS
coreutils

Package

Name
coreutils
Purl
pkg:deb/ubuntu/coreutils?arch=source&distro=xenial

Affected ranges

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

Affected versions

8.*
8.23-4ubuntu2
8.25-2ubuntu2
8.25-2ubuntu3~16.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.25-2ubuntu3~16.04",
            "binary_name": "coreutils"
        },
        {
            "binary_version": "8.25-2ubuntu3~16.04",
            "binary_name": "mktemp"
        },
        {
            "binary_version": "8.25-2ubuntu3~16.04",
            "binary_name": "realpath"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"
Ubuntu:18.04:LTS
coreutils

Package

Name
coreutils
Purl
pkg:deb/ubuntu/coreutils?arch=source&distro=bionic

Affected ranges

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

Affected versions

8.*
8.26-3ubuntu4
8.28-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.28-1ubuntu1",
            "binary_name": "coreutils"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"
Ubuntu:20.04:LTS
coreutils

Package

Name
coreutils
Purl
pkg:deb/ubuntu/coreutils?arch=source&distro=focal

Affected ranges

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

Affected versions

8.*
8.30-3ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.30-3ubuntu2",
            "binary_name": "coreutils"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"
Ubuntu:22.04:LTS
coreutils

Package

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

Affected ranges

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

Affected versions

8.*
8.32-4ubuntu2
8.32-4ubuntu3
8.32-4.1ubuntu1
8.32-4.1ubuntu1.1
8.32-4.1ubuntu1.2
8.32-4.1ubuntu1.3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "8.32-4.1ubuntu1.3",
            "binary_name": "coreutils"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"
Ubuntu:24.04:LTS
coreutils

Package

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

Affected ranges

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

Affected versions

9.*
9.1-1ubuntu2
9.4-2ubuntu1
9.4-2ubuntu2
9.4-2ubuntu3
9.4-2ubuntu4
9.4-3ubuntu3
9.4-3ubuntu5
9.4-3ubuntu6
9.4-3ubuntu6.1
9.4-3ubuntu6.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.4-3ubuntu6.2",
            "binary_name": "coreutils"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"
Ubuntu:26.04:LTS
coreutils

Package

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

Affected ranges

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

Affected versions

9.*
9.5-1ubuntu4
9.7-3ubuntu1
9.7-3ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.7-3ubuntu2",
            "binary_name": "gnu-coreutils"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56392.json"