SB2026080754 - Download of code without integrity check in Natural Language Toolkit

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Main Vulnerability Database SB2026080754

SB2026080754 - Download of code without integrity check in Natural Language Toolkit

Published: August 7, 2026

Security Bulletin ID SB2026080754
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Download of code without integrity check (CVE-ID: N/A)

CWE-ID: CWE-494 - Download of Code Without Integrity Check

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to inject malicious packages.

The vulnerability exists due to download of code without integrity check in the package downloader in nltk/downloader.py when downloading and extracting packages. A remote attacker can tamper with a downloaded package or supply a crafted package archive to inject malicious packages.

Exploitation may be possible via a man-in-the-middle attack during HTTP downloads, DNS poisoning to redirect requests to an attacker-controlled server, or a race condition on shared filesystems between file replacement and extraction.


Remediation

Install update from vendor's website.

References