CVE-2026-109956

High

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.

SeverityHigh

CVSS7.0

Exploit probability—

ProductNltk

PublishedOct 13, 2026

First seenOct 13, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

nltk3.10.4 or later

Vendor advisories

github.com/nltk/nltk/security/advisories/GHSA-j456-xh4h-cpf2

Affected products

Product	Affected versions	Fixed in
nltkPyPI	v < 3.10.4	3.10.4

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