CVE WatchJul 24, 2026

CVE-2025-71408

NLTK (Natural Language Toolkit) before version 3.9.3 contains an eval injection vulnerability in the nltk.collocations module that allows an

CVSS

7.8

High

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jul 24, 2026 · Last modified: Jul 24, 2026 · CWE-95

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-252026-07-26

Technical 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.

Official references

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