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

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

https://cvefeed.io/rssfeed/latest.atom / Sat, 07/25/2026 - 01:07
CVE ID :CVE-2025-71408
Published : July 24, 2026, 10:16 p.m. | 34 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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