Security advisory

{
  "id": "5a60edeabcded8064d42cd04ede931edb45910a0c3ef1e68e3ba5c582394266a",
  "url": "https://osv.dev/vulnerability/CVE-2025-46656",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2025-46656",
    "summary": "python-markdownify (aka markdownify) before 0.14.1 allows large headline prefixes such as in addition to through . This causes memory consumption.",
    "evidence": "osv:CVE-2025-46656",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-46656",
      "aliases": [
        "CVE-2025-46656",
        "GHSA-7mpr-5m44-h73r",
        "PYSEC-2026-1604"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/matthewwithanm/python-markdownify",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8f70e3952f7f8132777e60ed098f8974e51f7cbd"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.14.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:matthewwithanm:markdownify:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.14.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.14.0",
            "0.13.1",
            "0.13.0",
            "0.12.1",
            "0.12.0",
            "0.11.6",
            "0.11.5",
            "0.11.4",
            "0.11.3",
            "0.11.2",
            "0.11.1",
            "0.11.0",
            "0.10.3",
            "0.10.2",
            "0.10.1",
            "0.10.0",
            "0.9.4",
            "0.9.3",
            "0.9.2",
            "0.9.1",
            "0.9.0",
            "0.8.1",
            "0.8.0",
            "0.7.4",
            "0.7.3",
            "0.7.2",
            "0.7.1",
            "0.7.0",
            "0.6.6",
            "0.6.5",
            "0.6.4",
            "0.6.3",
            "0.6.2",
            "0.6.1",
            "0.5.3",
            "0.5.2",
            "0.5.0",
            "0.4.0",
            "0.3.0",
            "0.2.0",
            "0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-46656.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.111233379Z",
      "provider": "osv",
      "references": [
        "https://github.com/matthewwithanm/python-markdownify/compare/0.14.0...0.14.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/46xxx/CVE-2025-46656.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-46656",
        "https://github.com/matthewwithanm/python-markdownify/issues/143"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-1284"
        ],
        "cna_assigner": "mitre",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/46xxx/CVE-2025-46656.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-46656",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517432,
  "published_at": "2025-04-26T00:00:00+00:00"
}