PT-2026-64418 · Ntlk · Ntlk

Yunus Aydin · CVE-2025-71408 · Publicado 2026-07-24 · Atualizado 2026-07-24

Mitre

CVSS v3.1

7.8

Alta

Vetor base

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Exploit

Correção

Eval Injection

Enumeração de Fraquezas

CWE-95

Identificadores relacionados

CVE-2025-71408

Produtos afetados

Ntlk

Referências · 6

• 🔥 https://aydinnyunus.github.io/2026/06/07/command-injection-nltk-collocations-eval · Exploit
• https://github.com/nltk/nltk/commit/66f14096d952ec8f04934f515e027534bd4eb0ac · Correção
• https://github.com/nltk/nltk/releases/tag/3.9.3 · Nota
• https://github.com/nltk/nltk/pull/3465 · Nota
• https://vulncheck.com/advisories/nltk-eval-injection-via-collocations-py-command-line-arguments · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2025-71408 · Nota de Segurança