CVE-2025-6638
Hugging Face Transformers is vulnerable to ReDoS through its MarianTokenizer
5.3
MEDIUM
CVSS 3.1
EPSS 0.04%
Description
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.
How to fix CVE-2025-6638
To remediate CVE-2025-6638, upgrade the affected package to a fixed version below.
- —upgrade to 4.53.0 or later
Is CVE-2025-6638 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 4.53.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |