Critical severity9.8NVD Advisory· Published Aug 25, 2026
CVE-2026-79657
CVE-2026-79657
Description
NLTK versions before 3.10.3 contain a remote code execution vulnerability in allowlisted pickle loaders that trust entire module namespaces instead of specific safe callables. Attackers can craft malicious pickle payloads invoking dangerous in-namespace functions like ReppTokenizer._execute and numpy.f2py.crackfortran.myeval through pickle REDUCE to execute arbitrary commands during model or tokenizer artifact loading.
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Affected products
1Patches
Vulnerability mechanics
References
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