high7.5
CVE-2025-6638
Hugging Face Transformers is vulnerable to ReDoS through its MarianTokenizer
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | transformers | < 4.53.0 | 4.53.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Huggingface | Transformers | Version 4.52.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/huggingface/transformers/commit/47c34fba5c303576560cb29767efb452ff12b8be
- https://huntr.com/bounties/6a6c933f-9ce8-4ded-8b3b-2c1444c61f36
- https://github.com/advisories/GHSA-59p9-h35m-wg4g
- https://nvd.nist.gov/vuln/detail/CVE-2025-6638
- https://github.com/huggingface/transformers/commit/d37f7517972f67e3f2194c000ed0f87f064e5099