VULNERABILITY INTELLIGENCE

CVE-2026-79657

CVSS score9.8 CRITICAL
EPSS probability1.27%
CISA KEVNot currently listed
Published2026-08-25
Last modified2026-10-08
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • disclosure@vulncheck.com: CWE-502

Primary references