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CVE-2026-81726— NLTK through 3.10.3 Path Traversal via Model-Artifact APIs

Quick assessment

Affected
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.

Natural Language Toolkit是Natural Language Toolkit组织开源的一个自然语言处理工具包。 Natural Language Toolkit 3.10.3及之前版本存在输入验证错误漏洞，该漏洞源于模型工件API对调用者控制的路径使用原始文件操作，绕过pathsec强制，攻击者可在启用pathsec时通过TransitionParser、AveragedPerceptron、PerceptronTagger和maxent参数API读取或写入允许的沙箱根目录之外的文件

CVSS 7.0 · High EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1084

Affected Version Matrix 1

VendorProduct Version RangeStatus
nltk nltk ≤ 3.10.3 affected
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I. Basic Information for CVE-2026-81726

Vulnerability Information
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Vulnerability Title
NLTK through 3.10.3 Path Traversal via Model-Artifact APIs
Source: CVE Program / CVE List V5
Vulnerability Description
NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Natural Language Toolkit 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Natural Language Toolkit是Natural Language Toolkit组织开源的一个自然语言处理工具包。 Natural Language Toolkit 3.10.3及之前版本存在输入验证错误漏洞，该漏洞源于模型工件API对调用者控制的路径使用原始文件操作，绕过pathsec强制，攻击者可在启用pathsec时通过TransitionParser、AveragedPerceptron、PerceptronTagger和maxent参数API读取或写入允许的沙箱根目录之外的文件
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 0 ~ 3.10.3 -

II. Public POCs for CVE-2026-81726

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III. Intelligence Information for CVE-2026-81726

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Vendor Advisories for CVE-2026-81726 (2)

Same Patch Batch · nltk · 2026-08-27 · 6 CVEs total

CVE-2026-81722 7.5 HIGH nltk PorterStemmer before 3.10.3 Quadratic-time DoS
CVE-2026-81727 7.1 HIGH NLTK before 3.10.3 Hardlink File Overwrite via downloader
CVE-2026-81724 5.3 MEDIUM NLTK before 3.10.3 Denial of Service via Uncontrolled Recursion
CVE-2026-81723 3.7 LOW NLTK before 3.10.3 Quadratic CPU Exhaustion via XMLCorpusView
CVE-2026-81725 3.7 LOW NLTK before 3.10.3 Regular Expression Denial of Service via Pl196xCorpusReader

IV. Related Vulnerabilities

Same product: nltk
Same vendor: nltk
Same weakness: CWE-73

V. Comments for CVE-2026-81726

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