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CVE-2025-71408

7.8 · HIGH

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…

Published Jul 24, 2026CWE-95EPSS 0.27%

Overview

CVE-2025-71408 is a high-severity vulnerability. It was published on July 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refaydinnyunus.github.io/2026/06/07/command-injection-nltk-collocations-eval/GitHubgithub.com/nltk/nltk/commit/66f14096d952ec8f04934f515e027534bd4eb0acGitHubgithub.com/nltk/nltk/pull/3465GitHubgithub.com/nltk/nltk/releases/tag/3.9.3Refwww.vulncheck.com/advisories/nltk-eval-injection-via-collocations-py-command-line-arguments

How CyberStrike helps

Frequently asked questions

What is CVE-2025-71408?

CVE-2025-71408 is a high-severity vulnerability. It was published on July 24, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-71408?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-71408?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-71408?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-71408 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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