Denial of Service Vulnerability in NLTK's WordNet Browser HTTP Server
CVE-2026-33231

7.5HIGH

Key Information:

Vendor

Nltk

Status
Nltk
Vendor
CVE Published:
20 March 2026

What is CVE-2026-33231?

The NLTK (Natural Language Toolkit) is an open-source suite of Python modules that facilitates Natural Language Processing research and development. In certain versions, specifically 3.9.3 and earlier, an unauthenticated remote shutdown vulnerability exists in the WordNet Browser HTTP server. This issue allows a malicious actor to send a GET /SHUTDOWN%20THE%20SERVER request, which leads to an immediate termination of the server process via os._exit(0), effectively resulting in a denial of service. A patch has been implemented in commit bbaae83db86a0f49e00f5b0db44a7254c268de9b to resolve this vulnerability.

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Deploy the Patch

Affected Version(s)

nltk <= 3.9.3

References

https://github.com/nltk/nltk/security/advisories/GHSA-jm6...
x_refsource_CONFIRM
https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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