Vulnerability 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, `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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nltk | Nltk | <= 3.9.3 |
Related Weaknesses (CWE)
References
- https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9bPatch
- https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898gExploitVendor Advisory
FAQ
What is CVE-2026-33231?
CVE-2026-33231 is a vulnerability with a CVSS score of 7.5 (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, `nlt...
How severe is CVE-2026-33231?
CVE-2026-33231 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33231?
Check the references section above for vendor advisories and patch information. Affected products include: Nltk Nltk.