Security advisory

{
  "id": "06690e30bc13c09ada1a4cef5f83400f7f2a2c2d7a6cb95e8a7cdf8c5158c9f6",
  "url": "https://osv.dev/vulnerability/CVE-2026-42479",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-42479",
    "summary": "An out-of-bounds read vulnerability in VrmlData_IndexedLineSet::TShape in the VRML parser in Open CASCADE Technology (OCCT) V8_0_0_rc5 allows attackers to cause a denial of service via a crafted VRML file. The issue occurs because coordIndex values from parsed input are used as direct array indices without validation against the size of the coordinate array during geometry processing.",
    "evidence": "osv:CVE-2026-42479",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-42479",
      "aliases": [
        "CVE-2026-42479"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/open-cascade-sas/occt",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a016080bf6738d6aeae020badee4e888ad1540a5"
                },
                {
                  "introduced": "344d6139b6d2a63849949442d1d12e684d3413b5"
                },
                {
                  "last_affected": "0ebbbedb239d6fffb7e1c8c2d36970a3ab1d9300"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "7.9.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:beta1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0-beta1"
                      },
                      {
                        "last_affected": "8.0.0-beta1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0-rc1"
                      },
                      {
                        "last_affected": "8.0.0-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0-rc2"
                      },
                      {
                        "last_affected": "8.0.0-rc2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0-rc3"
                      },
                      {
                        "last_affected": "8.0.0-rc3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc4:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0-rc4"
                      },
                      {
                        "last_affected": "8.0.0-rc4"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:opencascade:open_cascade_technology:8.0.0:rc5:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.0.0-rc5"
                      },
                      {
                        "last_affected": "8.0.0-rc5"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "8.0.0-beta1",
            "8.0.0-rc1",
            "8.0.0-rc2",
            "8.0.0-rc3",
            "8.0.0-rc4",
            "8.0.0-rc5",
            "V8_0_0_rc5",
            "V8_0_0_rc4",
            "V8_0_0_rc3",
            "V7_9_3",
            "V7_9_2",
            "V7_9_1",
            "V8_0_0_rc2",
            "V7_9_0",
            "V8_0_0_rc1",
            "V7_9_0_beta2",
            "V7_9_0_beta1",
            "V7_8_0",
            "V7_7_0",
            "V7_7_0_beta",
            "V7_6_0",
            "V7_5_0",
            "V7_5_0_beta",
            "V7_4_0",
            "V7_4_0_beta",
            "V7_3_0",
            "V7_3_0_beta",
            "V7_2_0",
            "V7_2_0_beta",
            "V7_1_0",
            "V7_0_0",
            "V7_1_0_beta",
            "V7_0_0rc",
            "V7_0_0_beta",
            "V6_9_0",
            "V6_9_0_beta2",
            "V6_9_0_beta1",
            "V6_9_0_beta",
            "V6_8_0",
            "V6_8_0_beta",
            "V6_7_0",
            "V6_7_0_beta",
            "V6_6_0",
            "V6_6_0_beta",
            "V6_5_4",
            "V6_5_4_beta1",
            "V6_5_3",
            "V6_5_3_beta1",
            "V6_5_2",
            "V6_5_1",
            "V6_5_0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42479.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.590975991Z",
      "provider": "osv",
      "references": [
        "https://gist.github.com/sgInnora/dfba083d04906283e9c92aea78e2d94a",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42479.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42479"
      ],
      "provider_metadata": {
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42479.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42479",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513811,
  "published_at": "2026-05-01T00:00:00+00:00"
}