CVE-2025-6638
HIGHHugging Face Transformers < 4.53.0 - Regular Expression Denial of Service in MarianTokenizer
Title source: llmDescription
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.
References (2)
Core 2
Core References
Exploit, Third Party Advisory
https://huntr.com/bounties/6a6c933f-9ce8-4ded-8b3b-2c1444c61f36
Scores
CVSS v3
7.5
EPSS
0.0049
EPSS Percentile
37.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-1333
Status
published
Products (2)
huggingface/transformers
4.52.4
pypi/transformers
0 - 4.53.0PyPI
Published
Sep 12, 2025
Tracked Since
Feb 18, 2026