CVE-2026-33236
Description
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.
How to fix
- nltk3.9.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nltk nltk | v ≤ 3.9.3 | — |
| nltkPyPI | v ≤ 3.9.2, v < 3.9.4 | 3.9.4 |
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Attack Surface Management
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