CVE-2026-9856 | Hugging Face transformers up to 5.9.x PreTrainedTokenizerBase/ProcessorMixin save_pretrained path traversal

A vulnerability classified as problematic has been found in Hugging Face transformers up to 5.9.x. This impacts the function save_pretrained of the component PreTrainedTokenizerBase/ProcessorMixin. This manipulation causes path traversal.

This vulnerability is registered as CVE-2026-9856. Remote exploitation of the attack is possible. No exploit is available.

It is recommended to upgrade the affected component.