Is CVE-2026-109956 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-109956?

CVE-2026-109956 has a CVSS v3 severity of HIGH (7).

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CVE-2026-109956

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.