CVE-2026-47747 stable-diffusion.cpp has a Heap-based Buffer Overflow
A heap buffer overflow in stable-diffusion.cpp allows attackers to execute arbitrary code or cause denial of service via crafted checkpoint files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-47747?
CVE-2026-47747 is a high-severity memory corruption vulnerability in leejet stable-diffusion.cpp, published on 16 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2026-47747?
It affects 1 product.
Products include Leejet Stable-Diffusion.cpp.
How do I fix CVE-2026-47747?
No fix has been published for CVE-2026-47747 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-47747 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-47747 exists.
Other vulnerabilities in leejet stable-diffusion.cpp
- CVE-2026-47749 stable-diffusion.cpp: Heap buffer overflow in SHORT_BINUNICODE parsing for PyTorch checkpoint files
- CVE-2026-47750 stable-diffusion.cpp: Heap buffer overflow in GLOBAL opcode parsing for PyTorch checkpoint files
- CVE-2026-47748 stable-diffusion.cpp: Out-of-bounds reads in PyTorch checkpoint pickle opcode parsing
Sources
Also known as GHSA-mghm-5mqc-pwmp.