CVE-2026-65915: Nltk

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.

Affected products

• Nltk Nltk: before 3.10.0 (fixed in 3.10.0)

Published 2026-08-22. Last modified 2026-08-31.