Vulnerability Description
stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inference. In versions prior to master-584-0a7ae07, the pickle .ckpt parser in src/model.cpp contained a heap buffer overflow vulnerability in the BINUNICODE opcode handler. The issue was caused by sign confusion on the opcode length field. A crafted .ckpt file could trigger memcpy with a very large length derived from a negative signed value, causing immediate heap corruption. The issue has been resolved in version master-584-0a7ae07. If developers are unable to immediately update their applications they can work around this issue by only loading .ckpt checkpoint files from trusted sources and preferring trusted model sources and safer formats such as .safetensors where possible.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Leejet | Stable-Diffusion.Cpp | < master-584-0a7ae07 |
Related Weaknesses (CWE)
References
- https://github.com/leejet/stable-diffusion.cpp/commit/0a7ae07f948eff4611968a65a2Patch
- https://github.com/leejet/stable-diffusion.cpp/pull/1443Issue TrackingPatch
- https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-mghm-5mqExploitMitigationVendor Advisory
- https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-mghm-5mqExploitMitigationVendor Advisory
FAQ
What is CVE-2026-47747?
CVE-2026-47747 is a vulnerability with a CVSS score of 7.8 (HIGH). stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inference. In versions prior to master-584-0a7ae07, the pickle .ck...
How severe is CVE-2026-47747?
CVE-2026-47747 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-47747?
Check the references section above for vendor advisories and patch information. Affected products include: Leejet Stable-Diffusion.Cpp.