CVE-2026-0846
High
Description
A vulnerability in the `filestring()` function of the `nltk.util` module in nltk version 3.9.2 allows arbitrary file read due to improper validation of input paths. The function directly opens files specified by user input without sanitization, enabling attackers to access sensitive system files by providing absolute paths or traversal paths. This vulnerability can be exploited locally or remotely, particularly in scenarios where the function is used in web APIs or other interfaces that accept user-supplied input.
SeverityHigh
CVSS7.5
Exploit probability—
ProductNltk
PublishedMar 9, 2026
First seenMar 9, 2026
Weakness typeCWE-36CWE-36
How to fix
Update
- nltk3.9.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nltk nltk | 3.9.2 | — |
| nltkPyPI | v < 3.9.3, v ≤ 3.9.2 | 3.9.3 |
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