Bug 2523372 (CVE-2026-79657) - CVE-2026-79657 nltk: NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization
Summary: CVE-2026-79657 nltk: NLTK before 3.10.3 Remote Code Execution via Unsafe Pick...
Keywords:
Status: NEW
Alias: CVE-2026-79657
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2543417 2543418
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-25 11:43 UTC by OSIDB Bzimport
Modified: 2026-09-29 18:07 UTC (History)
20 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-25 11:43:08 UTC 
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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