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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
#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
kimi-k2.5 · 6218 chars
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III. Intelligence Information for CVE-2026-33231
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IV. Related Vulnerabilities
V. Comments for CVE-2026-33231

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