CVE-2026-78680

High

Description

NLTK versions before 3.10.3 fail to use validated absolute paths when invoking the Graphviz dot binary in dependencygraph.dot2img and AlignedSent._repr_svg_, allowing attackers to execute arbitrary code by placing a malicious dot binary in the search path or current working directory. Attackers can exploit bare-name binary resolution on Windows via the current working directory or on Unix-like systems via relative PATH entries to execute their binary instead of the legitimate Graphviz tool.

SeverityHigh

CVSS7.8

Exploit probability—

ProductNltk

PublishedAug 25, 2026

First seenAug 25, 2026

Weakness typeCWE-426CWE-426

How to fix

Update

nltk3.10.3 or later

Vendor advisories

github.com/nltk/nltk/security/advisories/GHSA-6hwm-xvph-95vm

Affected products

Product	Affected versions	Fixed in
nltkPyPI	v < 3.10.3	3.10.3

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