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CVE-2025-71408

HIGH
7.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2025-71408
State
PUBLISHED
Assigner
VulnCheck
Reserved
2026-07-24 20:57 UTC
Published
2026-07-24 21:07 UTC
Last updated
2026-07-24 21:18 UTC
Primary CWE
CWE-95
Improper Neutralization of Directives in Dynamically Evaluat…
Vendor / Product
ntlk / ntlk
Sources
cve.org  ·  NVD

Severity & Metrics

7.8 HIGH CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products (1)
VendorProductPlatformVersions
ntlk ntlk — 0 < 3.9.3
Weakness (CWE)
CWESourceDescription
CWE-95 cna Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
CVSS scores (2)
ScoreSeverityVersionSourceVector
8.5 HIGH 4.0 cna CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8 HIGH 3.1 cna CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References (5)
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