CVE-2025-2099
Description
A vulnerability in the `preprocess_string()` function of the `transformers.testing_utils` module in huggingface/transformers version v4.48.3 allows for a Regular Expression Denial of Service (ReDoS) attack. The regular expression used to process code blocks in docstrings contains nested quantifiers, leading to exponential backtracking when processing input with a large number of newline characters. An attacker can exploit this by providing a specially crafted payload, causing high CPU usage and potential application downtime, effectively resulting in a Denial of Service (DoS) scenario.
How to fix
- transformers4.50.0, 4.49.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| huggingface transformers | v ≤ 4.48.3 | — |
| transformersPyPI | v < 4.50.0, v < 4.49.0 | 4.50.0, 4.49.0 |
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