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PYSEC-2026-3736

Quick fix

PYSEC-2026-3736 — nltk: upgrade to the fixed version with the command below.

pip install --upgrade 'nltk>=3.10.3'

Details

NLTK versions before 3.10.3 contain a path sandbox bypass vulnerability in corpus-reader constructors that allows attackers to read files outside the intended data root. Attackers can supply arbitrary corpus root paths to LinThesaurusCorpusReader and PanLexLiteCorpusReader constructors to access filesystem content and SQLite databases outside the pathsec sandbox boundary.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/nltk

Introduced in: 0Fixed in: 3.10.3

Fixpip install --upgrade 'nltk>=3.10.3'

References

https://www.vulncheck.com/advisories/nltk-path-traversal-via-corpus-reader-constructors[ADVISORY]
https://github.com/nltk/nltk/security/advisories/GHSA-3gq4-3j92-5w49[EVIDENCE]