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PYSEC-2026-3740

Quick fix

PYSEC-2026-3740 — nltk: upgrade to the fixed version with the command below.

pip install --upgrade 'nltk>=3.10.3'

Details

NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.

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-through-3.10.3-path-traversal-via-model-artifact-apis[ADVISORY]
https://github.com/nltk/nltk/security/advisories/GHSA-8mgp-746c-j5xp[EVIDENCE]