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Ubuntu Security Notice USN-8214-1
April 28, 2026

nltk vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

NLTK could be made to crash or run programs as your login if it opened a
specially crafted zip file.

Software Description:
- 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 24.04 LTS
  python3-nltk                    3.8.1-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  python3-nltk                    3.7-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  python3-nltk                    3.4.5-2ubuntu0.1~esm3
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  python-nltk                     3.2.5-1ubuntu0.1+esm3
                                  Available with Ubuntu Pro
  python3-nltk                    3.2.5-1ubuntu0.1+esm3
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  python-nltk                     3.1-1ubuntu0.1+esm3
                                  Available with Ubuntu Pro
  python3-nltk                    3.1-1ubuntu0.1+esm3
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  python-nltk                     2.0~b9-0ubuntu4.1~esm5
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8214-1
  CVE-2025-14009