CVE-2026-78680

HighCVSS 7.8/10Last modified Oct 12, 2026

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-426

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
nltk	nltk	< 3.10.3

References

Timeline

Published: Aug 25, 2026
Last modified: Oct 12, 2026
NVD status: Awaiting Analysis

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