Bug 2489776 (CVE-2026-12199) - CVE-2026-12199 nltk: NLTK: Remote unauthenticated denial of service in WordNet Browser HTTP server
Summary: CVE-2026-12199 nltk: NLTK: Remote unauthenticated denial of service in WordNe...
Keywords:
Status: NEW
Alias: CVE-2026-12199
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-17 08:01 UTC by OSIDB Bzimport
Modified: 2026-06-17 13:59 UTC (History)
23 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-17 08:01:26 UTC 
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.
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