CVE-2025-71408 – NLTK < 3.9.2 Eval Injection via collocations.py Command-Line Arguments

CVE ID :CVE-2025-71408

Published : July 24, 2026, 9:07 p.m. | 43 minutes ago

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.

Severity: 8.5 | HIGH

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