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Directory Traversal Affecting nltk package, versions <3.7-1ubuntu0.1~esm2

Severity

 Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.6% (49th percentile)

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  • Snyk IDSNYK-UBUNTU2204-NLTK-15789998
  • published26 May 2026
  • disclosed20 Mar 2026
Report a new vulnerability Found a mistake?

Introduced: 20 Mar 2026

CVE-2026-33236  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Ubuntu:22.04 nltk to version 3.7-1ubuntu0.1~esm2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream nltk package and not the nltk package as distributed by Ubuntu. See How to fix? for Ubuntu:22.04 relevant fixed versions and status.

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, the NLTK downloader does not validate the subdir and id attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as ../), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.