PYSEC-2026-3735

vendorUSosv
view advisory published 2026-08-25Licence: CC-BY-4.0

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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describes (1)

Related CVEs.

IDseverity exploitable
CVE-2026-79657UScritical9.8—
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. Atta…
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