CVE-2026-109956 [HIGH] – NLTK through 3.10.3 contains a path traversal vulnerability in WekaClassifier that allows

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.