Is CVE-2026-78680 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-78680?

CVE-2026-78680 has a CVSS v3 severity of HIGH (7.8).

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CVE-2026-78680

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.