CVE-2026-33231
NLTK has unauthenticated remote shutdown in nltk.app.wordnet_app
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` allows unauthenticated remote shutdown of the local WordNet Browser HTTP server when it is started in its default mode. A simple `GET /SHUTDOWN%20THE%20SERVER` request causes the process to terminate immediately via `os._exit(0)`, resulting in a denial of service. Commit bbaae83db86a0f49e00f5b0db44a7254c268de9b patches the issue.
| CWE | CWE-306 |
| Vendor | nltk |
| Product | nltk |
| Published | Mar 20, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
nltk / nltk
<= 3.9.3
References
github.com: https://github.com/nltk/nltk/security/advisories/GHSA-jm6w-m3j8-898g github.com: https://github.com/nltk/nltk/commit/bbaae83db86a0f49e00f5b0db44a7254c268de9b access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-33231 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2449836 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33231.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:24977 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:19712 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:37275