nltk: NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting researc...
CVE-2026-33231 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, `nltk.app.wordnet_app` allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple `GET /SHUTDOWN%20THE%20SERVER` request causes the process to terminate immediately via `os._exit(0)`, resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nltk · Debian 14 | 3.10.0-1 | DEBIAN-CVE-2026-33231 | 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 |
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