CVE-2026-65915

Medium

Description

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductNltk

PublishedAug 22, 2026

First seenAug 22, 2026

Weakness typeCWE-284Improper access control

How to fix

Update

nltk nltk3.10.0 or later
nltk3.10.0 or later

Vendor advisories

github.com/nltk/nltk/security/advisories/GHSA-72r2-7mfr-5xr9

Affected products

Product	Affected versions	Fixed in
nltk nltk	v < 3.10.0	3.10.0
nltkPyPI	v < 3.10.0	3.10.0

Check your version

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