CVE-2026-109956— NLTK through 3.10.3 Path Traversal via WekaClassifier Model Path
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 及之前版本在 WekaClassifier 中存在路径遍历漏洞。攻击者通过提供未经验证的模型路径，可绕过 nltk.pathsec 的安全限制。若攻击者控制了 model_filename 或 model 参数，便可利用该漏洞通过 -d 参数使 Weka JVM 写入文件，或通过 -l 参数探测位于允许的数据根目录之外的文件。
Possible ATT&CK Techniques 3 AI
T1564 · Hide Artifacts T1059 · Command and Scripting Interpreter T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-109956
Vulnerability Information
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Vulnerability Title
NLTK through 3.10.3 Path Traversal via WekaClassifier Model Path
Source: CVE Program / CVE List V5
Vulnerability Description
NLTK through 3.10.3 contains a path traversal vulnerability in WekaClassifier that allows attackers to bypass nltk.pathsec containment by supplying unvalidated model paths. Attackers controlling the model_filename or model argument can make the weka JVM write files via -d or probe files via -l outside allowed data roots.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:L
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
Affected Products
II. Public POCs for CVE-2026-109956
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-109956 (2)
IV. Related Vulnerabilities
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