SB2026110236 - Path traversal in Hugging Face Transformers

Description

This security bulletin contains information about 1 vulnerability.

1) Path traversal (CVE-ID: CVE-2026-75104)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 5.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to read arbitrary files outside the model directory.

The vulnerability exists due to Hugging Face Transformers fails to validate shard filenames in checkpoint index files. A local user can supply malicious index files with parent-directory references or absolute paths that are joined without validation, enabling file disclosure and filesystem reconnaissance.

Remediation

Install update from vendor's website.

References

• https://github.com/huggingface/transformers
• https://github.com/huggingface/transformers/blob/main/src/transformers/utils/hub.py
• https://github.com/huggingface/transformers/issues/47176
• https://github.com/huggingface/transformers/issues/47177
• https://www.vulncheck.com/advisories/hugging-face-transformers-path-traversal-via-checkpoint-index