UBUNTU-CVE-2026-121969

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Source
https://ubuntu.com/security/CVE-2026-121969
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-121969
Upstream
Published
2026-11-05T00:00:00Z
Modified
2026-11-06T01:00:36Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

netrek-client-cow through 3.3.3 contains a stack-based buffer overflow vulnerability in handleSMessage() in short.c that allows malicious servers to overflow a 100-byte stack buffer by sending oversized SP_S_MESSAGE packets. A malicious Netrek server or man-in-the-middle on the plaintext TCP connection can send overlong or unterminated message bodies to write server-controlled bytes onto the stack and crash the client.

References

Affected packages

Ubuntu:16.04:LTS
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=xenial

Affected ranges

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

Affected versions

3.*
3.3.0-3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.0-3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"
Ubuntu:18.04:LTS
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.3.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"
Ubuntu:20.04:LTS
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=focal

Affected ranges

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

Affected versions

3.*
3.3.1-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.1-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"
Ubuntu:22.04:LTS
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.3.2-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"
Ubuntu:24.04:LTS
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.3.2-1
3.3.2-1build1
3.3.2-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.2-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"
Ubuntu:26.04:LTS
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.3.2-1build2
3.3.2-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.2-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"
Ubuntu:26.10
netrek-client-cow

Package

Name
netrek-client-cow
Purl
pkg:deb/ubuntu/netrek-client-cow?arch=source&distro=stonking

Affected ranges

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

Affected versions

3.*
3.3.2-1build3
3.3.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "netrek-client-cow",
            "binary_version": "3.3.3-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-121969.json"