MEDIUM6.5

PYSEC-2026-3729

Quick fix

PYSEC-2026-3729 — nltk: upgrade to the fixed version with the command below.

pip install --upgrade 'nltk>=3.9.3'

Details

NLTK before 3.9.3 fails to verify file integrity after downloading packages and before extraction in the downloader module. Attackers can perform man-in-the-middle attacks or DNS poisoning to inject malicious package contents that are extracted without validation.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/nltk

Introduced in: 0Fixed in: 3.9.3

Fixpip install --upgrade 'nltk>=3.9.3'

References

https://www.vulncheck.com/advisories/nltk-before-missing-post-download-integrity-verification[ADVISORY]
https://github.com/nltk/nltk/security/advisories/GHSA-5wp5-5229-5g6q[EVIDENCE]