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CVE-2025-6638

Regular Expression Denial of Service (ReDoS) in huggingface/transformers

Published: Sep 12, 2025Updated: Oct 21, 2025 Sources: CVE List NVD GHSACWE-1333
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 62.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-1333

Affected Products

transformershuggingface
LibraryLibrary
AI / ML / ml-framework
huggingface/transformershuggingface
LibraryLibrary
AI / ML / ml-framework
transformersPyPIOSS Libraries
huggingfacecommercialAI / MLaka transformers, huggingface/transformers, smolagents
pypipackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/huggingface/transformers/commit/47c34fba5c303576560cb29767efb452ff12b8be
github.com
https://huntr.com/bounties/6a6c933f-9ce8-4ded-8b3b-2c1444c61f36
huntr.com
https://nvd.nist.gov/vuln/detail/CVE-2025-6638
nvd.nist.gov
and 2 more references View all →

Timeline

Published
Sep 12, 2025
Last Updated
Oct 21, 2025

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