Security advisory

{
  "id": "a99bea73c5e4a810ecfeac37f659e54ead7a7ab45972bd741f014b5895fc3314",
  "url": "https://osv.dev/vulnerability/CVE-2026-2327",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2026-2327",
    "summary": "Versions of the package markdown-it from 13.0.0 and before 14.1.1 are vulnerable to Regular Expression Denial of Service (ReDoS) due to the use of the regex /\\*+$/ in the linkify function. An attacker can supply a long sequence of * characters followed by a non-matching character, which triggers excessive backtracking and may lead to a denial-of-service condition.",
    "evidence": "osv:CVE-2026-2327",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-2327",
      "aliases": [
        "CVE-2026-2327",
        "GHSA-38c4-r59v-3vqw"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/markdown-it/markdown-it",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6ec0b76ebe439f5858ae51d8e0cb45ee4a7ad46c"
                },
                {
                  "fixed": "b4a9b659ef5734223731cfaa3ad5eacc6fc22918"
                },
                {
                  "fixed": "4b4bbcae5e0990a5b172378e507b33a59012ed26"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:markdown-it_project:markdown-it:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "13.0.0"
                      },
                      {
                        "fixed": "14.1.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4b4bbcae5e0990a5b172378e507b33a59012ed26"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "14.1.0",
            "14.0.0",
            "13.0.2",
            "13.0.1",
            "13.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-2327.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.747202819Z",
      "provider": "osv",
      "references": [
        "https://gist.github.com/ltduc147/c9abecae1b291ede4f692f2ab988c917",
        "https://github.com/markdown-it/markdown-it/blob/14.1.0/lib/rules_inline/linkify.mjs%23L33",
        "https://security.snyk.io/vuln/SNYK-JS-MARKDOWNIT-10666750",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2327.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-2327",
        "https://github.com/markdown-it/markdown-it/commit/4b4bbcae5e0990a5b172378e507b33a59012ed26"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1333"
        ],
        "cna_assigner": "snyk",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2327.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-2327",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489967,
  "published_at": "2026-02-12T05:00:07.369+00:00"
}