UBUNTU-CVE-2026-33231

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Source
https://ubuntu.com/security/CVE-2026-33231
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-33231
Upstream
Published
2026-03-20T23:16:00Z
Modified
2026-03-25T17:36:54Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, nltk.app.wordnet_app allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple GET /SHUTDOWN%20THE%20SERVER request causes the process to terminate immediately via os._exit(0), resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.

References

Affected packages

Ubuntu:22.04:LTS
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@3.7-1?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.5-1
3.6.5-1
3.6.7-1
3.7-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-nltk",
            "binary_version": "3.7-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"
Ubuntu:24.04:LTS
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@3.8.1-1?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.8.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-nltk",
            "binary_version": "3.8.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"
Ubuntu:25.10
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@3.9.1-2?arch=source&distro=questing

Affected ranges

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

Affected versions

3.*
3.9.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-nltk",
            "binary_version": "3.9.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"
Ubuntu:Pro:14.04:LTS
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@2.0~b9-0ubuntu4.1~esm4?arch=source&distro=esm-infra-legacy/trusty

Affected ranges

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

Affected versions

2.*
2.0~b9-0ubuntu4
2.0~b9-0ubuntu4.1~esm2
2.0~b9-0ubuntu4.1~esm4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-nltk",
            "binary_version": "2.0~b9-0ubuntu4.1~esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"
Ubuntu:Pro:16.04:LTS
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@3.1-1ubuntu0.1+esm2?arch=source&distro=esm-apps/xenial

Affected ranges

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

Affected versions

3.*
3.0.4-1
3.0.5-1
3.1-1
3.1-1ubuntu0.1
3.1-1ubuntu0.1+esm1
3.1-1ubuntu0.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-nltk",
            "binary_version": "3.1-1ubuntu0.1+esm2"
        },
        {
            "binary_name": "python3-nltk",
            "binary_version": "3.1-1ubuntu0.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"
Ubuntu:Pro:18.04:LTS
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@3.2.5-1ubuntu0.1+esm2?arch=source&distro=esm-apps/bionic

Affected ranges

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

Affected versions

3.*
3.2.4-1
3.2.5-1
3.2.5-1ubuntu0.1
3.2.5-1ubuntu0.1+esm1
3.2.5-1ubuntu0.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python-nltk",
            "binary_version": "3.2.5-1ubuntu0.1+esm2"
        },
        {
            "binary_name": "python3-nltk",
            "binary_version": "3.2.5-1ubuntu0.1+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"
Ubuntu:Pro:20.04:LTS
nltk

Package

Name
nltk
Purl
pkg:deb/ubuntu/nltk@3.4.5-2ubuntu0.1~esm2?arch=source&distro=esm-apps/focal

Affected ranges

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

Affected versions

3.*
3.4.5-1
3.4.5-2
3.4.5-2ubuntu0.1~esm1
3.4.5-2ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-nltk",
            "binary_version": "3.4.5-2ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-33231.json"