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CVE-2026-9856— Path Traversal 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公司的一款面向自然语言处理的机器学习模型库。 Hugging Face Transformers 5.8.0.dev0及之前版本存在路径遍历漏洞，该漏洞源于save_pretrained()方法中chat_template字典键未经验证直接用作文件名，可能导致路径遍历，攻击者能够写入任意文件。

AI Predicted 8.2 Difficulty: Easy EPSS 0.46% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
huggingface huggingface/transformers unspecified< 5.10.0 affected
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I. Basic Information for CVE-2026-9856

Vulnerability Information
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Vulnerability Title
Path Traversal in huggingface/transformers
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in huggingface/transformers versions <=5.8.0.dev0 allows an attacker to perform arbitrary file writes via path traversal. The issue resides in the `save_pretrained()` methods of `PreTrainedTokenizerBase` and `ProcessorMixin`, where keys from the `chat_template` dictionary are used directly as filenames without proper validation. An attacker can exploit this by publishing a malicious Hugging Face Hub repository with a crafted `tokenizer_config.json` file. When a victim downloads and saves the tokenizer or processor, the attacker-controlled keys can escape the intended save directory, enabling arbitrary file writes with attacker-controlled content. This vulnerability affects multiple processors inheriting from `ProcessorMixin`, including Idefics, Florence, Gemma, Phi, and Qwen-VL.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Hugging Face Transformers 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hugging Face Transformers是Hugging Face公司的一款面向自然语言处理的机器学习模型库。 Hugging Face Transformers 5.8.0.dev0及之前版本存在路径遍历漏洞，该漏洞源于save_pretrained()方法中chat_template字典键未经验证直接用作文件名，可能导致路径遍历，攻击者能够写入任意文件。
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 ~ 5.10.0 -

II. Public POCs for CVE-2026-9856

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III. Intelligence Information for CVE-2026-9856

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Patches & Fixes for CVE-2026-9856 (1)

Vendor Advisories for CVE-2026-9856 (1)

IV. Related Vulnerabilities

Same product: huggingface/transformers
Same vendor: huggingface
Same weakness: CWE-22

V. Comments for CVE-2026-9856

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