Heap-buffer-overflow in Assimp::D3MF::D3MFExporter::writeFaces

{
  "id": "23b8f5722e02b643c881b4492f86854513bda60026ed7df3ee32a1b161a5984b",
  "url": "https://osv.dev/vulnerability/OSV-2026-1035",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap-buffer-overflow in Assimp::D3MF::D3MFExporter::writeFaces",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=531123003 ``` Crash type: Heap-buffer-overflow READ 4 Crash state: Assimp::D3MF::D3MFExporter::writeFaces Assimp::D3MF::D3MFExporter::writeMesh Assimp::D3MF::D3MFExporter::writeObjects ```",
    "evidence": "osv:OSV-2026-1035",
    "products": [
      {
        "name": {
          "value": "assimp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2026-1035",
      "aliases": [
        "OSV-2026-1035"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/assimp/assimp.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "16c50d7b53b5b6536599135004fb003c5e6f88b8"
                },
                {
                  "fixed": "d59e42da06d4e182845aa47dab5848269efd998d"
                }
              ]
            }
          ],
          "package": {
            "name": "assimp",
            "purl": "pkg:generic/assimp",
            "ecosystem": "OSS-Fuzz"
          },
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/assimp/OSV-2026-1035.yaml",
            "fixed_range": "c3f68d29c4237435652ec242e00928d5dd2b3011:d59e42da06d4e182845aa47dab5848269efd998d",
            "introduced_range": "e86df1f8b139f4095653d37dc08622fa5d206663:e2fd15f8f78d99e08fd3d3f90d7add3bf310b122"
          },
          "ecosystem_specific": {
            "severity": "MEDIUM"
          }
        }
      ],
      "modified": "2026-10-24T16:15:02.918540349Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=531123003"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 443935,
  "published_at": "2026-07-06T00:16:31.257098+00:00"
}