nltk: NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting researc...
CVE-2026-33236 is fixed in 3 products on 1 platform, first by python-nltk 3.2.5-1ubuntu0.1+esm4, released March 20, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nltk · Debian 14 | 3.10.0-1 | DEBIAN-CVE-2026-33236 | Mar 20, 2026 |
| python-nltk · Ubuntu 18.04.6 LTS (bionic) | 3.2.5-1ubuntu0.1+esm4 | python-nltk 3.2.5-1ubuntu0.1+esm4 | Mar 20, 2026 |
| python3-nltk · Ubuntu 18.04.6 LTS (bionic) | 3.2.5-1ubuntu0.1+esm4 | python3-nltk 3.2.5-1ubuntu0.1+esm4 | Mar 20, 2026 |
| python3-nltk · Ubuntu 20.04 LTS (focal) | 3.4.5-2ubuntu0.1~esm4 | python3-nltk 3.4.5-2ubuntu0.1~esm4 | Mar 20, 2026 |
| python3-nltk · Ubuntu 22.04.1 LTS (jammy) | 3.7-1ubuntu0.1~esm2 | python3-nltk 3.7-1ubuntu0.1~esm2 | Mar 20, 2026 |
| python3-nltk · Ubuntu 24.04.5 LTS (noble) | 3.8.1-1ubuntu0.1~esm2 | python3-nltk 3.8.1-1ubuntu0.1~esm2 | Mar 20, 2026 |
| python3-nltk · Ubuntu 26.04.1 LTS (resolute) | 3.9.2-1ubuntu0.1~esm2 | python3-nltk 3.9.2-1ubuntu0.1~esm2 | Mar 20, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.