VULNERABILITY INTELLIGENCE

CVE-2026-33236

CVSS score8.1 HIGH
EPSS probability0.60%
CISA KEVNot currently listed
Published2026-03-20
Last modified2026-07-21
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Description

NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, the NLTK downloader does not validate the `subdir` and `id` attributes when processing remote XML index files. Attackers can control a remote XML index server to provide malicious values containing path traversal sequences (such as `../`), which can lead to arbitrary directory creation, arbitrary file creation, and arbitrary file overwrite. Commit 89fe2ec2c6bae6e2e7a46dad65cc34231976ed8a patches the issue.

Weakness classification

  • security-advisories@github.com: CWE-22
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-22

Primary references