{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "0"
                  },
                  {
                    "fixed": "master-763-4fcc6fe"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              },
              {
                "range": [
                  {
                    "fixed": "4fcc6fef10c6f686801c6e257b22cd6a3deb906b"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "master-763-4fcc6fe",
                "range": [
                  {
                    "fixed": "4fcc6fef10c6f686801c6e257b22cd6a3deb906b"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4fcc6fef10c6f686801c6e257b22cd6a3deb906b"
            }
          ],
          "repo": "https://github.com/leejet/stable-diffusion.cpp",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6q7q-2v9c-x8m7"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-1284",
      "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70659.json"
  },
  "details": "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.",
  "id": "CVE-2026-70659",
  "modified": "2026-11-05T21:16:04.013960217Z",
  "published": "2026-11-05T15:26:33.019Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70659.json"
    },
    {
      "type": "FIX",
      "url": "https://github.com/leejet/stable-diffusion.cpp/commit/4fcc6fef10c6f686801c6e257b22cd6a3deb906b"
    },
    {
      "type": "FIX",
      "url": "https://github.com/leejet/stable-diffusion.cpp/pull/1750"
    },
    {
      "type": "WEB",
      "url": "https://github.com/leejet/stable-diffusion.cpp/releases/tag/master-763-4fcc6fe"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/leejet/stable-diffusion.cpp/security/advisories/GHSA-6q7q-2v9c-x8m7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-70659"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "stable-diffusion.cpp: Heap out-of-bounds write in the imatrix loader (`load_imatrix`) via a duplicate tensor name"
}