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Vulnerability record · CVE-2026-12199 · published 17 June 2026

CVE-2026-12199: Missing authentication for critical function vulnerability

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.

7.5 CVSS 3.0 High EPSS 0.33% · top 76.9% CWE-306 · Missing authentication for critical function Deferred
7.5CVSS 3.0 base score
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://huntr.com/bounties/cee4ca6a-d17f-4746-abad-c68119633d37
https://huntr.com/bounties/cee4ca6a-d17f-4746-abad-c68119633d37

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Source: NIST National Vulnerability Database (record CVE-2026-12199), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.