CVE-2025-3263: Huggingface Transformers

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically in the `get_configuration_file()` function within the `transformers.configuration_utils` module. The affected version is 4.49.0, and the issue is resolved in version 4.51.0. The vulnerability arises from the use of a regular expression pattern `config\.(.*)\.json` that can be exploited to cause excessive CPU consumption through crafted input strings, leading to catastrophic backtracking. This can result in model serving disruption, resource exhaustion, and increased latency in applications using the library.

Affected products

• Huggingface Transformers: from 4.49.0, before 4.51.0 (fixed in 4.51.0)

Published 2025-07-07. Last modified 2026-06-17.