nltk
CriticalPyPICVE-2026-78683
What to do
Update nltk to 3.10.0 or later.
pip install "nltk>=3.10.0"
An unsafe deserialisation flaw affects the PyPI package nltk. Affected versions: <= 3.9.4. Fixed from version 3.10.0.
What the flaw allows: Attacker-crafted objects are rebuilt without validation.
- Package
- nltk
- Ecosystem
- PyPI (Python)
- Class
- Unsafe deserialisation
- Affected versions
- <= 3.9.4
- Published on
- September 8, 2026
Sources
Entry built automatically from the cited security advisory, with no model rewriting. Acknowledged by the organisation or vendor, notified to an authority, or established by two independent sources.