CVE-2026-12199

Summary

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 Software

VendorProductVersion RangeStatus
nltknltk/nltkunspecified <= latestaffected

Weaknesses

  • CWE-306: CWE-306 Missing Authentication for Critical Function

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: yes
    • Technical Impact: partial

Additional References

References