CVE-2026-33231
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.
- Nltk
- ≤ 3.9.3
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.9% (55th percentile)
- Weakness
- CWE-306
- NVD status
- Modified
- Published
- 2026-03-20
No indexed exploits for CVE-2026-33231 yet
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