CVE-2025-71408
Description
NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an attacker who controls command-line arguments to execute arbitrary Python code. When collocations.py is invoked directly, the __main__ block passes command-line arguments directly to eval() as suffixes of BigramAssocMeasures without allowlist validation or sanitization, enabling an attacker to supply a Python expression that escapes the intended attribute lookup and executes arbitrary code including OS commands via the os module.
How to fix
- nltk nltk3.9.3 or later
- nltk3.9.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nltk nltk | v < 3.9.3 | 3.9.3 |
| nltkPyPI | v < 3.9.3 | 3.9.3 |
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