ESB-2026.4399 — Vulnetix

ESB-2026.4399 PUBLISHED CVSS 10 CRITICAL

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4399 USN-8214-1: NLTK vulnerability 29 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: NLTK Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2025-14009 Original Bulletin: https://ubuntu.com/security/notices/USN-8214-1 Comment: CVSS (Max): 10.0 CVE-2025-14009 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H EPSS (Max): 0.9% (75th) CVE-2025-14009 2026-04-28 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8214-1: NLTK vulnerability Publication date 28 April 2026 Overview NLTK could be made to crash or run programs as your login if it opened a specially crafted zip file. Releases 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS 16.04 LTS 14.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o nltk - Natural Language Toolkit Details It was discovered that NLTK incorrectly handled file extraction when opening a maliciously crafted zip file. An attacker could possibly use this issue to create or overwrite files on the system and execute arbitrary code. Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu Package Version Release 26.04 LTS python3-nltk - 3.9.2-1ubuntu0.1~esm1 Ubuntu Pro Fix available with resolute Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 24.04 LTS python3-nltk - 3.8.1-1ubuntu0.1~esm1 Ubuntu Pro Fix available with noble Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 22.04 LTS python3-nltk - 3.7-1ubuntu0.1~esm1 Ubuntu Pro Fix available with jammy Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 20.04 LTS python3-nltk - 3.4.5-2ubuntu0.1~esm3 Ubuntu Pro Fix available with focal Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. python-nltk - 3.2.5-1ubuntu0.1+esm3 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly 18.04 LTS available in the future. bionic python3-nltk - 3.2.5-1ubuntu0.1+esm3 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. python-nltk - 3.1-1ubuntu0.1+esm3 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly 16.04 LTS available in the future. xenial python3-nltk - 3.1-1ubuntu0.1+esm3 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 14.04 LTS python-nltk - 2.0~b9-0ubuntu4.1~esm5 Ubuntu Pro Fix available with trusty Ubuntu Pro via Legacy Support add-on. --------------------------------------------------------------------------------- References o CVE-2025-14009 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions
Ubuntu	NLTK

Timeline

Apr 29, 2026 CVE Published
Apr 29, 2026 Distribution Patch

References

Open in Interactive Console →