Security advisory

{
  "id": "2237de6dcc94157916cce5c736359ad853e6dff185947f167d1ccb24e178cf14",
  "url": "https://osv.dev/vulnerability/CVE-2021-21306",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-21306",
    "summary": "Marked is an open-source markdown parser and compiler (npm package \"marked\"). In marked from version 1.1.1 and before version 2.0.0, there is a Regular expression Denial of Service vulnerability. This vulnerability can affect anyone who runs user generated code through marked. This vulnerability is fixed in version 2.0.0.",
    "evidence": "osv:CVE-2021-21306",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-21306",
      "aliases": [
        "CVE-2021-21306",
        "GHSA-4r62-v4vq-hr96"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/markedjs/marked",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1ad8e69e9b959d0be03e6a345767daad28993f5d"
                },
                {
                  "fixed": "8a7502f54fcc236027ae38e5432c4caf30accf23"
                },
                {
                  "fixed": "7293251c438e3ee968970f7609f1a27f9007bccd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:marked_project:marked:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "1.1.1"
                      },
                      {
                        "fixed": "2.0.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "7293251c438e3ee968970f7609f1a27f9007bccd"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.2.9",
            "v1.2.8",
            "v1.2.7",
            "v1.2.6",
            "v1.2.5",
            "v1.2.4",
            "v1.2.3",
            "v1.2.2",
            "v1.2.1",
            "v1.1.2",
            "v1.20",
            "v1.1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21306.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:28.017234849Z",
      "provider": "osv",
      "references": [
        "https://github.com/markedjs/marked/issues/1927",
        "https://github.com/markedjs/marked/security/advisories/GHSA-4r62-v4vq-hr96",
        "https://www.npmjs.com/package/marked",
        "https://github.com/markedjs/marked/commit/7293251c438e3ee968970f7609f1a27f9007bccd",
        "https://github.com/markedjs/marked/pull/1864"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-21306",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385397,
  "published_at": "2021-02-08T22:15:12.45+00:00"
}