UBUNTU-CVE-2026-71513

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Source

https://ubuntu.com/security/CVE-2026-71513

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-71513

Upstream

CVE-2026-71513

Published

2026-08-25T00:00:00Z

Modified

2026-08-27T11:01:24.966860005Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft untrusted transition-parser models that execute arbitrary commands when TransitionParser.parse loads the model through allowlistedpickleload.

References

Affected packages

Ubuntu:Pro:14.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-infra-legacy%2Ftrusty

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

2.0~b9-0ubuntu4.1~esm5

2.0~b9-0ubuntu4.1~esm6

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.0~b9-0ubuntu4.1~esm6",
            "binary_name": "python-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"

Ubuntu:Pro:16.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-apps-legacy%2Fxenial

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

3.1-1ubuntu0.1+esm3

3.1-1ubuntu0.1+esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.1-1ubuntu0.1+esm4",
            "binary_name": "python-nltk"
        },
        {
            "binary_version": "3.1-1ubuntu0.1+esm4",
            "binary_name": "python3-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"

Ubuntu:Pro:18.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-apps%2Fbionic

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

3.2.5-1ubuntu0.1+esm3

3.2.5-1ubuntu0.1+esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.2.5-1ubuntu0.1+esm4",
            "binary_name": "python-nltk"
        },
        {
            "binary_version": "3.2.5-1ubuntu0.1+esm4",
            "binary_name": "python3-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"

Ubuntu:Pro:20.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-apps%2Ffocal

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

3.4.5-2ubuntu0.1~esm3

3.4.5-2ubuntu0.1~esm4

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.4.5-2ubuntu0.1~esm4",
            "binary_name": "python3-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"

Ubuntu:Pro:22.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-apps%2Fjammy

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

3.7-1ubuntu0.1~esm1

3.7-1ubuntu0.1~esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.7-1ubuntu0.1~esm2",
            "binary_name": "python3-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"

Ubuntu:Pro:24.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.8.1-1

3.8.1-1ubuntu0.1~esm1

3.8.1-1ubuntu0.1~esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.8.1-1ubuntu0.1~esm2",
            "binary_name": "python3-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"

Ubuntu:Pro:26.04:LTS

nltk

Package

Name: nltk
Purl: pkg:deb/ubuntu/nltk?arch=source&distro=esm-apps%2Fresolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.9.1-2

3.9.1-2build1

3.9.2-1

3.9.2-1ubuntu0.1~esm1

3.9.2-1ubuntu0.1~esm2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.9.2-1ubuntu0.1~esm2",
            "binary_name": "python3-nltk"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71513.json"