leejet stable-diffusion.cpp SHORT_BINUNICODE Parser out-of-bounds write

Summaryinfo

A vulnerability has been found in leejet stable-diffusion.cpp and classified as critical. The impacted element is an unknown function of the component SHORT_BINUNICODE Parser. Performing a manipulation results in out-of-bounds write. This vulnerability is reported as CVE-2026-47749. The attack requires a local approach. No exploit exists. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability classified as critical has been found in leejet stable-diffusion.cpp (the affected version unknown). This affects an unknown part of the component SHORT_BINUNICODE Parser. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

stable-diffusion.cpp is a pure C/C++ library for running diffusion model (Stable Diffusion, Flux, Wan, Qwen Image, Z-Image, and more) inference. Versions prior to master-584-0a7ae07 are vulnerable to heap buffer overflow in SHORT_BINUNICODE parsing for PyTorch checkpoint files. The pickle .ckpt parser in src/model.cpp contained a heap buffer overflow vulnerability in the SHORT_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. Any application using affected stable-diffusion.cpp releases to load untrusted .ckpt model files could be vulnerable. A malicious checkpoint file could cause heap corruption through memcpy with an attacker-controlled length. This may lead to process crash and could potentially be leveraged for code execution depending on heap layout. The attack requires the victim or application to load a .ckpt file from an untrusted source, such as a downloaded model from a model sharing site. 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 not loading .ckpt checkpoint files from untrusted sources, and referring to trusted model sources and safer formats such as .safetensors where possible.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-47749 since 05/20/2026. The exploitability is told to be easy. Attacking locally is a requirement. The technical details are unknown and an exploit is not publicly available.

Applying the patch master-584-0a7ae07 is able to eliminate this problem.

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Productinfo

Vendor

• leejet

Name

• stable-diffusion.cpp

Website

• Product: https://github.com/leejet/stable-diffusion.cpp/

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