CVE-2025-6638
September 12, 2025
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
transformers (CONDA):
Affected version(s) >=2.1.1 <4.53.0Fix Suggestion:
Update to version 4.53.0https://github.com/huggingface/transformers.git (GITHUB):
Affected version(s) >=v0.1.2 <v4.53.0Fix Suggestion:
Update to version v4.53.0transformers (PYTHON):
Affected version(s) >=0.1 <4.53.0Fix Suggestion:
Update to version 4.53.0Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Inefficient Regular Expression Complexity
EPSS
Base Score:
0.03
