{"id":"CVE-2026-70659","title":"stable-diffusion.cpp: Heap out-of-bounds write in the imatrix loader (`load_imatrix`) via a duplicate tensor name","summary":"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/runt…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-787","CWE-1284"],"vendor":"leejet","product":"stable-diffusion.cpp","affected":["stable-diffusion.cpp < master-763-4fcc6fe"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T15:26:33.019Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-70659","references":[{"url":"https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-6q7q-2v9c-x8m7","label":"https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-6q7q-2v9c-x8m7"},{"url":"https://github.com/leejet/stable-diffusion.cpp/pull/1750","label":"https://github.com/leejet/stable-diffusion.cpp/pull/1750"},{"url":"https://github.com/leejet/stable-diffusion.cpp/commit/4fcc6fef10c6f686801c6e257b22cd6a3deb906b","label":"https://github.com/leejet/stable-diffusion.cpp/commit/4fcc6fef10c6f686801c6e257b22cd6a3deb906b"},{"url":"https://github.com/leejet/stable-diffusion.cpp/releases/tag/master-763-4fcc6fe","label":"https://github.com/leejet/stable-diffusion.cpp/releases/tag/master-763-4fcc6fe"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T21:36:00.901Z","slug":"CVE-2026-70659","body":"## Overview\n\nstable-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.\n\n## Affected\n\n- `stable-diffusion.cpp < master-763-4fcc6fe`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}