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CVE-2026-33231— NLTK has unauthenticated remote shutdown in nltk.app.wordnet_app

CVSS 7.5 · High EPSS 0.02% · P5
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I. Basic Information for CVE-2026-33231

Vulnerability Information
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Vulnerability Title
NLTK has unauthenticated remote shutdown in nltk.app.wordnet_app
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
NLTK 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLTK是NLTK开源的一个自然语言工具包。用于支持自然语言处理的研究和开发。 NLTK 3.9.3及之前版本存在访问控制错误漏洞，该漏洞源于nltk.app.wordnet_app允许未经身份验证的远程关闭本地WordNet Browser HTTP服务器，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
nltknltk <= 3.9.3 -

II. Public POCs for CVE-2026-33231

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III. Intelligence Information for CVE-2026-33231

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Same Patch Batch · nltk · 2026-03-20 · 3 CVEs total

CVE-2026-332368.1 HIGHNLTK has a Downloader Path Traversal Vulnerability (AFO) - Arbitrary File Overwrite
CVE-2026-332306.1 MEDIUMnltk Vulnerable to Cross-site Scripting

IV. Related Vulnerabilities

Same product: nltk
Same vendor: nltk
Same weakness: CWE-306

V. Comments for CVE-2026-33231

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