CVE-2025-2099 – Huggingface Transformers ReDoS Vulnerability

CVE ID : CVE-2025-2099

Published : May 19, 2025, 12:15 p.m. | 52 minutes ago

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.

Severity: 5.3 | MEDIUM

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