CVE-2026-79676

Medium

Description

NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open() instead of nltk.pathsec.open(), allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose outside-root content through normal corpus reader methods like channels(), domains(), and synonyms().

SeverityMedium

CVSS5.9

Exploit probability—

ProductNltk

PublishedAug 25, 2026

First seenAug 25, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

nltk nltk3.10.3 or later
nltk3.10.3 or later

Vendor advisories

github.com/nltk/nltk/security/advisories/GHSA-p4rw-rvv2-7xwr

Affected products

Product	Affected versions	Fixed in
nltk nltk	v < 3.10.3	3.10.3
nltkPyPI	v < 3.10.3	3.10.3

Check your version

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