Hi,

The following vulnerability was published for nltk.

CVE-2026-12199[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-12199
https://www.cve.org/CVERecord?id=CVE-2026-12199
[1] https://huntr.com/bounties/cee4ca6a-d17f-4746-abad-c68119633d37

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore