Security advisory

{
  "id": "54381821941d02c31d30f7d4443633f9ffbe93cebab74680b3ef84717860965d",
  "url": "https://osv.dev/vulnerability/CVE-2018-10191",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-10191",
    "summary": "In versions of mruby up to and including 1.4.0, an integer overflow exists in src/vm.c::mrb_vm_exec() when handling OP_GETUPVAR in the presence of deep scope nesting, resulting in a use-after-free. An attacker that can cause Ruby code to be run can use this to possibly execute arbitrary code.",
    "evidence": "osv:CVE-2018-10191",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2018-10191",
      "aliases": [
        "CVE-2018-10191"
      ],
      "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/mruby/mruby",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "58fb6f421ad9824caae5a2cabb849d48647b90ec"
                },
                {
                  "fixed": "1905091634a6a2925c911484434448e568330626"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.4.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "1905091634a6a2925c911484434448e568330626"
                      }
                    ],
                    "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-2018-10191.json",
            "vanir_signatures": [
              {
                "id": "CVE-2018-10191-4f906dc6",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "318179098320671580796334812011546468836",
                    "31385894504806590158479134728976733374",
                    "291488986920338441806228910834754532837",
                    "234188554461621141776788455322527686487",
                    "12890778145267399150668197333810861362",
                    "46198236631767394421020263073167925398",
                    "315187527932322571882289740280446195103",
                    "295169726589021630819681535583790457470"
                  ]
                },
                "source": "https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626",
                "target": {
                  "file": "src/vm.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2018-10191-9de90541",
                "digest": {
                  "length": 34172,
                  "function_hash": "105486956670678688502489234273124890437"
                },
                "source": "https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626",
                "target": {
                  "file": "src/vm.c",
                  "function": "mrb_vm_exec"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:28:32Z"
          }
        }
      ],
      "modified": "2026-10-20T13:28:32.615844452Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html",
        "https://github.com/mruby/mruby/issues/3995",
        "https://github.com/mruby/mruby/commit/1905091634a6a2925c911484434448e568330626"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.0"
                  },
                  {
                    "last_affected": "9.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2018-10191",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 387719,
  "published_at": "2018-04-17T21:29:00.233+00:00"
}