A Regular Expression Denial of Service (ReDoS) vulnerability was discovered in the Hugging Face Transformers library, specifically affecting the MarianTokenizer's `remove_language_code()` method. This vulnerability is present in version 4.52.4 and has been fixed in version 4.53.0. The issue arises from inefficient regex processing, which can be exploited by crafted input strings containing malformed language code patterns, leading to excessive CPU consumption and potential denial of service.
This bug impacts my https://slitheriogame.io web game that uses huggingface/transformers. The ReDoS issue slows down gameplay when certain inputs are processed.
This update addresses CVE-2025-6638, a medium-severity https://mapsdirectionsdriving.com/ ReDoS vulnerability in huggingface/transformers. While impact is limited, fixing it is necessary to prevent potential denial-of-service risks in regex processing. Silent deployment is appropriate, but downstream users should still update promptly.