CVE-2026-70660

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CVE-2026-70660

Summary: stable-diffusion.cpp: Out-of-bounds read in safetensors loader: unvalidated data_offsets allow a tensor's byte range to extend past the end of the file

Details: stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inference. Prior to master-764-e22272e, the safetensors loader in src/model_io/safetensors_io.cpp trusts each tensor's data_offsets after checking only that nbytes equals end - begin. A crafted .safetensors file can declare a byte range beyond the file's data section, causing src/model_loader.cpp to consume an attacker-chosen length from an unchecked mapped-file offset. Loading the model can read adjacent process memory into tensor buffers or crash the process. This issue is fixed in master-764-e22272e.

References: https://github.com/leejet/stable-diffusion.cpp/releases/tag/master-764-e22272e, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70660.json, https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-v2m4-h57v-fr6w, https://nvd.nist.gov/vuln/detail/CVE-2026-70660, https://github.com/leejet/stable-diffusion.cpp/commit/e22272ee631b742dab4440c18eb8fcafb0689402, https://github.com/leejet/stable-diffusion.cpp/pull/1754