External Control of File Name or Path Affecting nltk package, versions [,3.10.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-NLTK-19639047
- published7 Sept 2026
- disclosed2 Sept 2026
- creditUnknown
Introduced: 2 Sep 2026
NewCVE-2026-81727 (opens in a new tab)How to fix?
Upgrade nltk to version 3.10.3 or higher.
Overview
nltk is a Natural Language Toolkit (NLTK) is a Python package for natural language processing.
Affected versions of this package are vulnerable to External Control of File Name or Path via the Downloader.download and Downloader.incr_download file-write path in nltk/downloader.py. An attacker who can place a hardlink inside a writable shared downloader root can make a normal package install overwrite the linked inode, mutating files outside the intended install tree.