Is CVE-2026-12199 actively exploited?

No active exploitation of CVE-2026-12199 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-12199 be exploited remotely?

Yes. CVE-2026-12199 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-12199?

CVE-2026-12199 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-12199

HIGH

CVE-2026-12199

CWE-306Published: June 17, 2026· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2026-12199 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.