CVE-2026-33231
NLTK has unauthenticated remote shutdown in nltk.app.wordnet_app
- State
- Published
- Severity
- 7.5 High
- Published
- Mar 20, 2026
- Updated
- Sep 9, 2026
- Reserved
- Mar 18, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat-SADP |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
nltknltk |
|
References
- https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g
- https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b
- https://access.redhat.com/security/cve/CVE-2026-33231vdb-entry
- RHBZ#2449836issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json
- https://access.redhat.com/errata/RHSA-2026:24977vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:65126vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:19712vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:37275vendor-advisory
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