CVE-2026-12199
Unauthenticated Denial of Service in nltk.app.wordnet_app
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-306 |
| Vendor | nltk |
| Product | nltk/nltk |
| Published | Jun 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affected Versions
nltk / nltk/nltk
unspecified ≤ latest