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CVE-2026-12199 A vulnerability in `nltk.app.wordnet_app` up to version 3.9.3 allows unauthenticated remote shutdown of the local…

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.

Affected products and versions

Product Affected versions Fixed in
nltk/nltk Versions not published

References

Timeline

  1. Published
  2. Last modified

Other CVEs of nltk/nltk

The 12 CVEs of nltk/nltk →
CVE-2026-12372 A Server-Side Request Forgery (SSRF) vulnerability exists in nltk/nltk versions 3.9.4 and the current develop branch 3.7 Low CVE-2026-12261 A vulnerability in `nltk.downloader` in nltk/nltk… 5.3 Medium CVE-2026-12259 In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes… 5.3 Medium CVE-2026-12252 In nltk/nltk versions 3.9.3 and earlier, five Stanford interface classes (StanfordPOSTagger, StanfordNERTagger,… 7.8 High
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