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CVE-2025-6051— Regular Expression Denial of Service (ReDoS) in huggingface/transformers

Quick assessment

Affected
huggingface huggingface/transformers
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hugging Face Transformers是Hugging Face开源的为 Jax、PyTorch 和 TensorFlow 打造的先进的自然语言处理。 Hugging Face Transformers 4.52.4及之前版本存在安全漏洞，该漏洞源于EnglishNormalizer类的normalize_numbers方法对数字字符串处理不当，可能导致正则表达式拒绝服务攻击。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-6051

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service (ReDoS) in huggingface/transformers
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Hugging Face Transformers 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hugging Face Transformers是Hugging Face开源的为 Jax、PyTorch 和 TensorFlow 打造的先进的自然语言处理。 Hugging Face Transformers 4.52.4及之前版本存在安全漏洞，该漏洞源于EnglishNormalizer类的normalize_numbers方法对数字字符串处理不当，可能导致正则表达式拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
huggingface huggingface/transformers unspecified ~ 4.53.0 -

II. Public POCs for CVE-2025-6051

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III. Intelligence Information for CVE-2025-6051

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IV. Related Vulnerabilities

Same product: huggingface/transformers
Same vendor: huggingface
Same weakness: CWE-1333

V. Comments for CVE-2025-6051

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