Hugging Face Transformers fails to validate shard filenames in checkpoint index files, allowing attackers to read arbitrary files outside the model directory. Attackers can supply malicious index files with parent-directory references or absolute paths that are joined without validation, enabling file disclosure and filesystem reconnaissance.
https://www.vulncheck.com/advisories/hugging-face-transformers-path-traversal-via-checkpoint-index
https://github.com/huggingface/transformers/issues/47177
https://github.com/huggingface/transformers/issues/47176
https://github.com/huggingface/transformers/blob/main/src/transformers/utils/hub.py
Published: 2026-08-17
Updated: 2026-08-18
Base Score: 4.9
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:N/A:N
Severity: Medium
Base Score: 5.5
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Severity: Medium
Base Score: 6.8
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Severity: Medium