Heap-buffer-overflow in Assimp::FBXExporter::WriteObjects

{
  "id": "a8f73862f5bf84210ed28fde7476b4fbedf0e585263f4f3b95897c7d4d6680d2",
  "url": "https://osv.dev/vulnerability/OSV-2025-31",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Heap-buffer-overflow in Assimp::FBXExporter::WriteObjects",
    "summary": "OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=389339262 ``` Crash type: Heap-buffer-overflow READ 4 Crash state: Assimp::FBXExporter::WriteObjects Assimp::FBXExporter::ExportBinary Assimp::ExportSceneFBX ```",
    "evidence": "osv:OSV-2025-31",
    "products": [
      {
        "name": {
          "value": "assimp",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "v5.3.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v5.3.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v5.4.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v5.4.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v5.4.2",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "v5.4.3",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "master",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "OSV-2025-31",
      "aliases": [
        "OSV-2025-31"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/assimp/assimp.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "9d6b32f5c5118e67e99d4be3087f49ad0b7660de"
                },
                {
                  "fixed": "1933313ec82fe5f5a2feca949bced04cf194dda6"
                }
              ]
            }
          ],
          "package": {
            "name": "assimp",
            "purl": "pkg:generic/assimp",
            "ecosystem": "OSS-Fuzz"
          },
          "versions": [
            "v5.3.0",
            "v5.3.1",
            "v5.4.0",
            "v5.4.1",
            "v5.4.2",
            "v5.4.3",
            "master"
          ],
          "database_specific": {
            "source": "https://github.com/google/oss-fuzz-vulns/blob/main/vulns/assimp/OSV-2025-31.yaml",
            "fixed_range": "b40e41f9c3c413efd6818734585fe7dc7d0ec16c:1933313ec82fe5f5a2feca949bced04cf194dda6",
            "introduced_range": "41102eeda6aa1461a5f4a52a743b2a4133732f9c:0c4d5909f8ca1931f3ca5c66ab5f0c37ea2efc2e"
          },
          "ecosystem_specific": {
            "severity": "MEDIUM"
          }
        }
      ],
      "modified": "2026-10-20T17:23:07.739055449Z",
      "provider": "osv",
      "references": [
        "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=389339262"
      ]
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 389784,
  "published_at": "2025-01-15T00:14:05.357161+00:00"
}