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.

Metrics

No CVSS v4.0

No CVSS v3.1

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00183.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Huggingface
  • Transformers

Configuration 1 [-]

cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*

No data.

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Vendors Products
Huggingface
  • Transformers
Advisories
Source ID Title
EUVD EUVD EUVD-2025-20214 Transformers vulnerable to ReDoS attack through its get_imports() function
Github GHSA Github GHSA GHSA-jjph-296x-mrcr Transformers vulnerable to ReDoS attack through its get_imports() function
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/huggingface/transformers/commit/0720e206c6ba28887e4d60ef60a6a089f6c1cc76 cve-icon cve-icon cve-icon
https://huntr.com/bounties/3c6f7822-9992-476d-8cf0-b0b1623427df cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-3264 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-3264 cve-icon
History

Thu, 07 Aug 2025 01:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:huggingface:transformers:*:*:*:*:*:*:*:*

Sun, 13 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00042}

 epss

{'score': 0.00055}

Tue, 08 Jul 2025 00:30:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Moderate

Mon, 07 Jul 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 07 Jul 2025 10:00:00 +0000

Type Values Removed Values Added
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.
Title Regular Expression Denial of Service (ReDoS) in huggingface/transformers
Weaknesses CWE-1333
References
Metrics cvssV3_0

{'score': 5.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2025-07-07T14:40:12.531Z

Reserved: 2025-04-04T12:41:38.443Z

Link: CVE-2025-3264

cve-icon Vulnrichment

Updated: 2025-07-07T14:40:00.641Z

cve-icon NVD

Status : Analyzed

Published: 2025-07-07T10:15:27.500

Modified: 2025-08-07T01:02:30.700

Link: CVE-2025-3264

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-07-07T09:55:11Z

Links: CVE-2025-3264 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2025-07-13T21:47:21Z