CVE-2025-14009— Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution
Quick assessment
Affected
nltk nltk/nltk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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存在安全漏洞，该漏洞源于_unzip_iter函数使用zipfile.extractall()而未执行路径验证或安全检查，可能导致攻击者通过特制zip包执行任意代码。
Possible ATT&CK Techniques 3 AI
T1204 · User Execution T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-14009
Vulnerability Information
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Vulnerability Title
Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
A critical vulnerability exists in the NLTK downloader component of nltk/nltk, affecting all versions. The _unzip_iter function in nltk/downloader.py uses zipfile.extractall() without performing path validation or security checks. This allows attackers to craft malicious zip packages that, when downloaded and extracted by NLTK, can execute arbitrary code. The vulnerability arises because NLTK assumes all downloaded packages are trusted and extracts them without validation. If a malicious package contains Python files, such as __init__.py, these files are executed automatically upon import, leading to remote code execution. This issue can result in full system compromise, including file system access, network access, and potential persistence mechanisms.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
NLTK 安全漏洞
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存在安全漏洞，该漏洞源于_unzip_iter函数使用zipfile.extractall()而未执行路径验证或安全检查，可能导致攻击者通过特制zip包执行任意代码。
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-2025-14009
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V. Comments for CVE-2025-14009
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