CVE-2025-6921— Regular Expression Denial of Service (ReDoS) in huggingface/transformers
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
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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|---|
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IV. Related Vulnerabilities
Same product: huggingface/transformers
- CVE-2026-1839
Arbitrary Code Execution via Unsafe torch.load() in Trainer - CVE-2025-6051
Regular Expression Denial of Service (ReDoS) in huggingface/ - CVE-2025-6638
Regular Expression Denial of Service (ReDoS) in huggingface/ - CVE-2025-5197
Regular Expression Denial of Service (ReDoS) in huggingface/ - CVE-2025-3933
Regular Expression Denial of Service (ReDoS) in huggingface/
Same vendor: huggingface
- CVE-2026-1839
Arbitrary Code Execution via Unsafe torch.load() in Trainer - CVE-2026-4963
huggingface smolagents Incomplete Fix CVE-2025-9959 local_py - CVE-2026-2654
huggingface smolagents LocalPythonExecutor requests.post ser - CVE-2026-0599
Unbounded External Image Fetch in Validation Leads to Resour - CVE-2025-11844
XPath Injection in Hugging Face Smolagents search_item_ctrl_
Same weakness: CWE-400
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V. Comments for CVE-2025-6921
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