Hugging Face transformers Transformer-XL Model deserialization

Summaryinfo

A vulnerability categorized as problematic has been discovered in Hugging Face transformers. Impacted is an unknown function of the component Transformer-XL Model Handler. Such manipulation leads to deserialization. This vulnerability is uniquely identified as CVE-2025-14921. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Hugging Face transformers (affected version unknown). It has been rated as problematic. Affected by this issue is an unknown functionality of the component Transformer-XL Model Handler. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Hugging Face Transformers Transformer-XL Model Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Hugging Face Transformers. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of model files. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the current user. Was ZDI-CAN-25424.

The advisory is available at zerodayinitiative.com. This vulnerability is handled as CVE-2025-14921. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 12/24/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-204824). If you want to get best quality of vulnerability data, you may have to visit VulDB.

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Vendor

• Hugging Face

Name

• transformers

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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