UBUNTU-CVE-2026-103680

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Source
https://ubuntu.com/security/CVE-2026-103680
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-103680
Upstream
Published
2026-10-02T00:00:00Z
Modified
2026-10-02T22:30:17Z
Severity
  • 3.1 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A flaw was found in tnef. A heap-based buffer overflow can occur in the find_free_number() function when generating numbered backup suffixes for duplicate filenames. When numbered backups are enabled and file overwriting is disabled, an attacker can supply a specially crafted Transport Neutral Encapsulation Format (TNEF) file with an excessive number of colliding attachment filenames, causing the numeric counter to write past the allocated memory buffer. This issue may result in an application crash, leading to a Denial of Service (DoS), or potentially arbitrary code execution.

References

Affected packages

Ubuntu:16.04:LTS
tnef

Package

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

Affected ranges

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

Affected versions

1.*
1.4.9-1
1.4.9-1+deb8u2build0.16.04.1
1.4.9-1+deb8u3build0.16.04.1
1.4.9-1+deb8u4build0.16.04.1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "tnef",
            "binary_version":  "1.4.9-1+deb8u4build0.16.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json"
Ubuntu:18.04:LTS
tnef

Package

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

Affected ranges

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

Affected versions

1.*
1.4.12-1.2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "tnef",
            "binary_version":  "1.4.12-1.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json"
Ubuntu:20.04:LTS
tnef

Package

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

Affected ranges

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

Affected versions

1.*
1.4.12-1.2
1.4.18-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "tnef",
            "binary_version":  "1.4.18-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json"
Ubuntu:22.04:LTS
tnef

Package

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

Affected ranges

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

Affected versions

1.*
1.4.18-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "tnef",
            "binary_version":  "1.4.18-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json"
Ubuntu:24.04:LTS
tnef

Package

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

Affected ranges

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

Affected versions

1.*
1.4.18-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "tnef",
            "binary_version":  "1.4.18-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json"
Ubuntu:26.04:LTS
tnef

Package

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

Affected ranges

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

Affected versions

1.*
1.4.18-5
1.4.18-5build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "tnef",
            "binary_version":  "1.4.18-5build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103680.json"