Security advisory

{
  "id": "bde9ab40d6b6a6edad462b3cb5346f35b0145b2212065d1c2c85006e49610a8a",
  "url": "https://osv.dev/vulnerability/CVE-2016-9909",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2016-9909",
    "summary": "The serializer in html5lib before 0.99999999 might allow remote attackers to conduct cross-site scripting (XSS) attacks by leveraging mishandling of the < (less than) character in attribute values.",
    "evidence": "osv:CVE-2016-9909",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2016-9909",
      "aliases": [
        "CVE-2016-9909",
        "GHSA-v9v9-xffq-rwr4",
        "PYSEC-2017-14"
      ],
      "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/html5lib/html5lib-python",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "ebf62250d23317ae1f51d8b8e4a1d3b62b260ff1"
                },
                {
                  "fixed": "9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:html5lib:html5lib:*:1.0b8:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.99999999"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.99999999",
            "0.9999999",
            "0.999999",
            "0.99999",
            "0.9999",
            "0.999",
            "0.99",
            "1.0b3",
            "1.0b2",
            "1.0b1",
            "0.95",
            "0.90",
            "0.11.1ish",
            "0.11ish",
            "0.10ish",
            "0.9ish"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-9909.json"
          }
        }
      ],
      "modified": "2026-10-20T10:49:04.200652390Z",
      "provider": "osv",
      "references": [
        "https://github.com/html5lib/html5lib-python/issues/11",
        "https://github.com/html5lib/html5lib-python/issues/12",
        "https://html5lib.readthedocs.io/en/latest/changes.html#b9",
        "https://github.com/html5lib/html5lib-python/commit/9b8d8eb5afbc066b7fac9390f5ec75e5e8a7cab7"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2016-9909",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 380439,
  "published_at": "2017-02-22T16:59:00.38+00:00"
}