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CVE-2025-3264

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

Published: Jul 7, 2025Updated: Aug 7, 2025 Sources: CVE List NVD GHSA BDUCWE-1333
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.4%
Top 65.4%
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 in the `get_imports()` function within `dynamic_module_utils.py`. This vulnerability affects versions 4.49.0 and is fixed in version 4.51.0. The issue arises from a regular expression pattern `\s*try\s*:.*?except.*?:` used to filter out try/except blocks from Python code, which can be exploited to cause excessive CPU consumption through crafted input strings due to catastrophic backtracking. This vulnerability can lead to remote code loading disruption, resource exhaustion in model serving, supply chain attack vectors, and development pipeline disruption.

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

transformershuggingface
LibraryLibrary
AI / ML / ml-framework
transformersPyPIOSS Libraries
huggingface/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://github.com/huggingface/transformers/commit/0720e206c6ba28887e4d60ef60a6a089f6c1cc76
github.com
https://huntr.com/bounties/3c6f7822-9992-476d-8cf0-b0b1623427df
huntr.com
https://nvd.nist.gov/vuln/detail/CVE-2025-3264
nvd.nist.gov
and 3 more references View all →

Timeline

Published
Jul 7, 2025
Last Updated
Aug 7, 2025

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