Security advisory

{
  "id": "4ee20b1772aa8d4440e99c80fca17af45dc5cd61208022ea8ea122de11e94099",
  "url": "https://osv.dev/vulnerability/CVE-2018-5773",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-5773",
    "summary": "An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final '>' character from an IMG tag.",
    "evidence": "osv:CVE-2018-5773",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-5773",
      "aliases": [
        "CVE-2018-5773",
        "GHSA-p6h9-gw49-rqm4",
        "PYSEC-2018-13"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/trentm/python-markdown2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "9be8b9c2801e7f7d07b67e00ff51a15f21c61422"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:python-markdown2_project:python-markdown2:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.3.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "2.3.5",
            "2.3.4",
            "2.3.3",
            "2.3.2",
            "2.3.1",
            "2.3.0",
            "2.2.3",
            "2.2.2",
            "2.2.1",
            "2.2.0",
            "2.1.0",
            "2.0.1",
            "2.0.0",
            "1.4.2",
            "1.4.1",
            "1.4.0",
            "1.3.1",
            "1.3.0",
            "1.2.0",
            "1.1.1",
            "1.1.0",
            "1.0.1.19",
            "1.0.1.18"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-5773.json"
          }
        }
      ],
      "modified": "2026-10-20T10:50:28.963473553Z",
      "provider": "osv",
      "references": [
        "https://github.com/trentm/python-markdown2/issues/285"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-5773",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 381749,
  "published_at": "2018-01-18T21:29:00.267+00:00"
}