CVE-2026-12199— Unauthenticated Denial of Service in nltk.app.wordnet_app
Possible ATT&CK Techniques 2AI
T1499 · Endpoint Denial of Service T1499.002 · Service Exhaustion FloodGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-12199
Vulnerability Information
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Vulnerability Title
Unauthenticated Denial of Service in nltk.app.wordnet_app
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
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 nltk/nltk 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLTK是NLTK组织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 nltk/nltk 3.9.3及之前版本存在授权问题漏洞，该漏洞源于对关键服务器功能的身份验证和保护机制不足，可能导致未经身份验证的远程攻击者通过发送特定的未授权GET请求关闭本地WordNet Browser HTTP服务器，造成服务拒绝。
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
II. Public POCs for CVE-2026-12199
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Vendor Advisories for CVE-2026-12199 (1)
IV. Related Vulnerabilities
Same product: nltk/nltk
- CVE-2026-0846
Arbitrary File Read via Absolute Path Input in nltk.util.fil - CVE-2026-0848
Arbitrary Code Execution in NLTK StanfordSegmenter via Untru - CVE-2026-0847
Path Traversal in nltk/nltk - CVE-2025-14009
Zip Slip Vulnerability in nltk/nltk Leading to Remote Code E - CVE-2021-3842
Inefficient Regular Expression Complexity in nltk/nltk
Same vendor: nltk
- CVE-2026-54293
NLTK: URL-Encoded Path Traversal in nltk.data.load() Allows - CVE-2026-33236
NLTK has a Downloader Path Traversal Vulnerability (AFO) - A - CVE-2026-33231
NLTK has unauthenticated remote shutdown in nltk.app.wordnet - CVE-2026-33230
nltk Vulnerable to Cross-site Scripting - CVE-2026-0846
Arbitrary File Read via Absolute Path Input in nltk.util.fil
Same weakness: CWE-306
- CVE-2026-13325
Virt-handler-rhel9: kubevirt: kubevirt: disabletls migration - CVE-2026-43920
FOSSBilling: Unauthenticated update patcher endpoint allows - CVE-2025-71327
Flowise - Authentication Bypass via Unprotected Registration - CVE-2026-40702
EVoke Systems EVoke CSMS Missing Authentication for Critical - CVE-2026-54040
LibreChat: 2FA Backup Code Regeneration Without OTP Verifica
V. Comments for CVE-2026-12199
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