CVE-2026-62388: Nltk

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

NLTK versions before 3.10.0 default to ENFORCE=False in pathsec.py, causing all security validation functions to emit warnings instead of raising exceptions. Attackers can bypass path traversal and pickle deserialization protections by exploiting the disabled security controls that are only active when manually enabled.

Affected products

• Nltk Nltk: before 3.10.0 (fixed in 3.10.0)

Published 2026-08-22. Last modified 2026-08-27.