CVE-2025-3263: Regular Expression Denial of Service (ReDoS) in huggingface/transformers

Vulnerability summary

CVE-2025-3263 is a medium (CVSS 5.3) vulnerability in huggingface huggingface/transformers. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 42.5% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 07-07-2025
   PublishedVulnerability first disclosed.
2. 07-07-2025
   Last modifiedVulnerability information updated.

Description

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.

• CWE-1333Inefficient Regular Expression ComplexityThe product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.