CVE-2026-70659— stable-diffusion.cpp: Heap out-of-bounds write in the imatrix loader (`load_imatrix`) via a duplicate tensor name

Quick assessment

Affected

leejet stable-diffusion.cpp

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

stable-diffusion.cpp 是一个纯 C/C++ 库，用于运行扩散模型（包括 Stable Diffusion、Flux、Wan、Qwen Image、Z-Image 等）的推理。在从 master-742-1a13107 到 master-763-4fcc6fe 的版本范围内，src/runtime/imatrix.cpp 中的 IMatrixCollector::load_imatrix 函数会为具有相同张量名称的条目复用以 values 和 counts 向量，但仅在这些向量为空时才会调整其大小

CVSS 7.8 · High Updated Nov 05, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

stable-diffusion.cpp: Heap out-of-bounds write in the imatrix loader (`load_imatrix`) via a duplicate tensor name

Source: CVE Program / CVE List V5

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. From master-742-1a13107 until master-763-4fcc6fe, IMatrixCollector::load_imatrix in src/runtime/imatrix.cpp reuses the values and counts vectors for entries with the same tensor name but resizes them only when they are empty. An untrusted .imatrix file can provide a small nval for the first entry and a larger nval for a second entry with the same name, causing the accumulation loop to write attacker-controlled floating-point and integer values beyond both heap buffers. Loading the file through the --imat-in conversion path can corrupt the heap or crash the process before a model is required. This issue is fixed in master-763-4fcc6fe.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存写

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
leejet	stable-diffusion.cpp	< master-763-4fcc6fe	-

II. Public POCs for CVE-2026-70659

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-70659

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Other References for CVE-2026-70659 (4)

https://github.com/leejet/stable-diffusion.cpp/pull/1750 x_refsource_MISC
https://github.com/leejet/stable-diffusion.cpp/releases/tag/master-763-4fcc6fe x_refsource_MISC
https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-6q7q-2v9c-x8m7 x_refsource_CONFIRM
https://github.com/leejet/stable-diffusion.cpp/commit/4fcc6fef10c6f686801c6e257b22cd6a3deb906b x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-70659

IV. Related Vulnerabilities

Same product: stable-diffusion.cpp

Same vendor: leejet

Same weakness: CWE-787