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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.

NLTK 3.10.3 及更早版本中的模型工件（model-artifact）API 存在路径遍历漏洞。该漏洞通过调用方可控路径上的原始文件操作，绕过了 的安全检查。当 启用时，攻击者可通过 、 、 以及 maxent 参数相关 API，在允许的沙箱根目录之外读取或写入文件。

CVSS 7.0 · High

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

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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