Unauthenticated Denial of Service in nltk.app.wordnet_app_CVE-2026-12199

7.5 / 10

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

A vulnerability in `nltk.app.wordnet_app` up to version 3.9.3 allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when started in its default mode. The server listens on all interfaces and processes a specific unauthenticated GET request (`/SHUTDOWN%20THE%20SERVER`) to terminate the process immediately via `os._exit(0)`. This results in a denial of service, impacting service availability. The issue arises due to insufficient authentication and protection mechanisms for critical server functions.

Basic Information

ID CVE-2026-12199

Source @huntr_ai

Published Jun 17, 2026 at 07:13

Affected Product

Vendor nltk

Product nltk/nltk

Version unspecified

Affected Versions nltk nltk/nltk unspecified

CWE Classification

CWE-306

References

huntr.com /bounties/cee4ca6a-d17f-4746-abad-c68119633d37

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    "published": "2026-06-17T07:13:14.977Z",
    "modified": "2026-06-17T07:13:14.977Z",
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