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CVE-2026-0847— Path Traversal in nltk/nltk

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 3.9.2及之前版本存在路径遍历漏洞，该漏洞源于多个CorpusReader类未正确清理或验证文件路径，可能导致任意文件读取。

AI Predicted 8.1 Difficulty: Easy EPSS 0.90% · P56

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
nltk nltk/nltk unspecified≤ latest affected
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I. Basic Information for CVE-2026-0847

Vulnerability Information
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Vulnerability Title
Path Traversal in nltk/nltk
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
NLTK 路径遍历漏洞
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 3.9.2及之前版本存在路径遍历漏洞，该漏洞源于多个CorpusReader类未正确清理或验证文件路径，可能导致任意文件读取。
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

Vendor Product Affected Versions CPE Subscribe
nltk nltk/nltk unspecified ~ latest -

II. Public POCs for CVE-2026-0847

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III. Intelligence Information for CVE-2026-0847

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Vendor Advisories for CVE-2026-0847 (1)

IV. Related Vulnerabilities

Same product: nltk/nltk
Same vendor: nltk
Same weakness: CWE-22

V. Comments for CVE-2026-0847

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