Vulnerability Details CVE-2026-79657
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.012
EPSS Ranking 64.6%
CVSS Severity
CVSS v3 Score 9.8