CVE-2026-33231

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/20/2026

Last Modified3/23/2026

Sourcenvd

Honeypot Sightings0

Affected Products

nltk:nltk

Weaknesses (CWE)

CWE-306

References

https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b(security-advisories@github.com)

https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g(security-advisories@github.com)

IOC Correlations

No correlations recorded

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