CVSS 9.8 (critical) · published 2026-08-25
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.
Affected products (NVD): nltk nltk
Fixed in (NVD): 3.10.3
Weakness: CWE-502
Source: NVD CVE-2026-79657
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