CVE-2026-12199CWE-306

Unauthenticated Denial of Service in nltk.app.wordnet_app

High · published June 17, 2026

CVSS v3.0
7.5
EPSS
0%
Percentile
24.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.0
7.5 · HIGH
Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00325 · 24.3th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-06-17T07:13Z
EPSS history
Timeline
  • 17 JUN 07:13Z
    Unauthenticated Denial of Service in nltk.app.wordnet_app
    cvelistv5