Diffusers through 0.39.0, fixed in commit cee298c, contains a path traversal vulnerability in the _get_checkpoint_shard_files function that allows attackers to read arbitrary files by supplying malicious weight_map values in model index JSON. Attackers can use ../ sequences or absolute paths in weight_map entries to escape the model directory and read safetensors files outside the intended location during model loading.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/huggingface/diffusers/commit/cee298c1f37c439a9a408396b8283a9…
disclosure@vulncheck.com
https://github.com/huggingface/diffusers/issues/14175
disclosure@vulncheck.com
https://github.com/huggingface/diffusers/pull/14182
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/diffusers-path-traversal-via-weight-map-ar…
disclosure@vulncheck.com