CVE-2026-65920: Diffusers Path Traversal via weight_map Arbitrary File Read

Vulnerability summary

CVE-2026-65920 is a medium (CVSS 5.3) vulnerability in huggingface diffusers. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 34% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 23-07-2026
   PublishedVulnerability first disclosed.
2. 24-07-2026
   Last modifiedVulnerability information updated.

Description

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.

• CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.