Security proof-of-concept for a Denial-of-Service in foundation-model-stack/fastsafetensors (HEAD 8d35826). Reported via huntr's Model File Vulnerability program.

model.safetensors is a ~80-byte safetensors file whose header carries a tensor entry with an invalid dtype. Loading it crashes the parser with an uncaught ValueError, before any tensor data is read. This affects any app using fastsafetensors, including vLLM / SGLang started with --load-format fastsafetensors.