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CVE-2025-6921— 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.

transformers是Hugging Face开源的一个用于机器学习的应用程序。 transformers 4.53.0之前版本存在资源管理错误漏洞，该漏洞源于_do_use_weight_decay方法处理用户控制的正则表达式时存在缺陷，可能导致正则表达式拒绝服务攻击。

AI Predicted 5.3 Difficulty: Easy EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-6921

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
The huggingface/transformers library, versions prior to 4.53.0, is vulnerable to Regular Expression Denial of Service (ReDoS) in the AdamWeightDecay optimizer. The vulnerability arises from the _do_use_weight_decay method, which processes user-controlled regular expressions in the include_in_weight_decay and exclude_from_weight_decay lists. Malicious regular expressions can cause catastrophic backtracking during the re.search call, leading to 100% CPU utilization and a denial of service. This issue can be exploited by attackers who can control the patterns in these lists, potentially causing the machine learning task to hang and rendering services unresponsive.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
transformers 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
transformers是Hugging Face开源的一个用于机器学习的应用程序。 transformers 4.53.0之前版本存在资源管理错误漏洞，该漏洞源于_do_use_weight_decay方法处理用户控制的正则表达式时存在缺陷，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-2025-6921

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III. Intelligence Information for CVE-2025-6921

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IV. Related Vulnerabilities

Same product: huggingface/transformers
Same vendor: huggingface
Same weakness: CWE-400

V. Comments for CVE-2025-6921

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