CVE-2025-2099 — Regular Expression Denial of Service (ReDoS) in huggingface/transformers
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 Deni…
Published: 2025-05-19 · CVSS: 5.3 · CVSS 3.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7