CVE-2026-78680
NLTK before 3.10.3 Arbitrary Code Execution via Graphviz dot Binary
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-426 |
| Vendor | nltk |
| Product | nltk |
| Published | Aug 25, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
nltk / nltk
0 < 3.10.3