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CVE-2025-6051

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

Published: Sep 14, 2025Updated: Oct 21, 2025 Sources: CVE List NVD GHSA BDUCWE-1333
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 73.2%
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 within the `normalize_numbers()` method of the `EnglishNormalizer` class. This vulnerability affects versions up to 4.52.4 and is fixed in version 4.53.0. The issue arises from the method's handling of numeric strings, which can be exploited using crafted input strings containing long sequences of digits, leading to excessive CPU consumption. This vulnerability impacts text-to-speech and number normalization tasks, potentially causing service disruption, resource exhaustion, and API vulnerabilities.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:L
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:LAvailability
Low
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Weaknesses

CWE-1333

Affected Products

huggingface/transformershuggingface
LibraryLibrary
AI / ML / ml-framework
transformersPyPIOSS Libraries
transformershuggingface
LibraryLibrary
AI / ML / ml-framework
TransformersHugging Face, Inc.
Mixed
AI / ML / ml-framework
huggingfacecommercialAI / MLaka transformers, huggingface/transformers, smolagents
pypipackage-ecosystemOSS Libraries
hugging face, inc.commercialAI / MLaka huggingface, transformers, smolagents

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://huntr.com/bounties/af929523-7b59-418a-bf55-301830b2ac9d
huntr.com
https://github.com/huggingface/transformers/commit/ba8eaba9865618253f997784aa565b96206426f0
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-6051
nvd.nist.gov
and 3 more references View all →

Timeline

Published
Sep 14, 2025
Last Updated
Oct 21, 2025

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