Security advisory

{
  "id": "46d999475e053ca929711ed71fa0546bd119f1dde5ee1d79c572ca39e82f0dbc",
  "url": "https://osv.dev/vulnerability/CVE-2018-10199",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-10199",
    "summary": "In versions of mruby up to and including 1.4.0, a use-after-free vulnerability exists in src/io.c::File#initilialize_copy(). An attacker that can cause Ruby code to be run can possibly use this to execute arbitrary code.",
    "evidence": "osv:CVE-2018-10199",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-10199",
      "aliases": [
        "CVE-2018-10199"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mruby/mruby",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "58fb6f421ad9824caae5a2cabb849d48647b90ec"
                },
                {
                  "fixed": "b51b21fc63c9805862322551387d9036f2b63433"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b51b21fc63c9805862322551387d9036f2b63433"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "1.4.0",
            "1.2.0",
            "1.1.0",
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-10199.json",
            "vanir_signatures": [
              {
                "id": "CVE-2018-10199-3968ad5e",
                "digest": {
                  "length": 1032,
                  "function_hash": "176470287796102068116200247742974157189"
                },
                "source": "https://github.com/mruby/mruby/commit/b51b21fc63c9805862322551387d9036f2b63433",
                "target": {
                  "file": "mrbgems/mruby-io/src/io.c",
                  "function": "mrb_io_initialize_copy"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2018-10199-74069e8a",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "26428399209722362404772608474695113136",
                    "222149713925856606992976566986370645464",
                    "242975534844887006541029859650857140185",
                    "283945130415032626426675985272024724847",
                    "113971097661674165332142934430449657499",
                    "31486327155438268750255794855118764637",
                    "333268945746951759752781923786946114447",
                    "84224174781620867617528170324289898103",
                    "160934137204212079820212675447251727175",
                    "98899778162484268282287483093347673153",
                    "29675728426105141391949315817511663971"
                  ]
                },
                "source": "https://github.com/mruby/mruby/commit/b51b21fc63c9805862322551387d9036f2b63433",
                "target": {
                  "file": "mrbgems/mruby-io/src/io.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:28:31Z"
          }
        }
      ],
      "modified": "2026-10-20T13:28:31.854251915Z",
      "provider": "osv",
      "references": [
        "https://github.com/mruby/mruby/issues/4001",
        "https://github.com/mruby/mruby/commit/b51b21fc63c9805862322551387d9036f2b63433"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-10199",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387717,
  "published_at": "2018-04-18T15:29:00.207+00:00"
}