Security advisory

{
  "id": "932561dbb13542330817e8755093b6eabbd64203186d9f59f3cb3b8d834d9a5c",
  "url": "https://osv.dev/vulnerability/CVE-2025-50343",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-50343",
    "summary": "An issue was discovered in matio 1.5.28. A heap-based memory corruption can occur in Mat_VarCreateStruct() when the nfields value does not match the actual number of strings in the fields array. This leads to out-of-bounds reads and invalid memory frees during cleanup, potentially causing a segmentation fault or heap corruption. NOTE: Multiple third-parties note that the available evidence does not demonstrate a vulnerability exploitable through an attacker-controlled input path.",
    "evidence": "osv:CVE-2025-50343",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2025-50343",
      "aliases": [
        "CVE-2025-50343"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tbeu/matio",
              "type": "GIT",
              "events": [
                {
                  "introduced": "4677b3fd4030c52e0fe45a863c840c78fb56f9a3"
                },
                {
                  "last_affected": "4677b3fd4030c52e0fe45a863c840c78fb56f9a3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:matio_project:matio:1.5.28:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "1.5.28"
                      },
                      {
                        "last_affected": "1.5.28"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.5.28",
            "v1.5.28"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-50343.json"
          }
        }
      ],
      "modified": "2026-10-20T11:08:23.800821691Z",
      "provider": "osv",
      "references": [
        "https://github.com/zakkanijia/POC/blob/main/matio/CVE-2025-50343/matio.md",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/50xxx/CVE-2025-50343.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-50343",
        "https://github.com/tbeu/matio/issues/275"
      ],
      "provider_metadata": {
        "isDisputed": true,
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/50xxx/CVE-2025-50343.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-50343",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387124,
  "published_at": "2025-12-30T00:00:00+00:00"
}