Security advisory

{
  "id": "112e8c63e4928ab1f11e1aa78ef7f0e7615b2fbc5b04b95d0cd467b1eddf1054",
  "url": "https://osv.dev/vulnerability/CVE-2020-15866",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15866",
    "summary": "mruby through 2.1.2-rc has a heap-based buffer overflow in the mrb_yield_with_class function in vm.c because of incorrect VM stack handling. It can be triggered via the stack_copy function.",
    "evidence": "osv:CVE-2020-15866",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-15866",
      "aliases": [
        "CVE-2020-15866"
      ],
      "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": "f9d113f7647121f8578742a2a9ac256ece365e3f"
                },
                {
                  "introduced": "b6b9c57f247a26fb5dbea129cd81fcc9b7d485a3"
                },
                {
                  "last_affected": "b6b9c57f247a26fb5dbea129cd81fcc9b7d485a3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:mruby:mruby:2.1.2:rc:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.1.2-rc"
                      },
                      {
                        "last_affected": "2.1.2-rc"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.1.2-rc",
            "2.1.1",
            "2.1.1-rc2",
            "2.1.1-rc",
            "1.2.0",
            "1.1.0",
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15866.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:56.492957197Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2022/05/msg00006.html",
        "https://github.com/mruby/mruby/issues/5042"
      ],
      "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-2020-15866",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383145,
  "published_at": "2020-07-21T15:15:14.537+00:00"
}