Security advisory

{
  "id": "1a3edad756e399458de3d1ab10b295e0f88aca6572f92cf61c0eb0362d719a4d",
  "url": "https://osv.dev/vulnerability/CVE-2017-16876",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-16876",
    "summary": "Cross-site scripting (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the \"key\" argument.",
    "evidence": "osv:CVE-2017-16876",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2017-16876",
      "aliases": [
        "CVE-2017-16876",
        "GHSA-98gj-wwxm-cj3h",
        "PYSEC-2017-18"
      ],
      "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/lepture/mistune",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "cef69acaa506567595e95ab6ecea25a806de622e"
                },
                {
                  "fixed": "5f06d724bc05580e7f203db2d4a4905fc1127f98"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "5f06d724bc05580e7f203db2d4a4905fc1127f98"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.8",
            "v0.7.4",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7",
            "v0.6",
            "v0.5.1",
            "v0.5",
            "v0.4.1",
            "v0.4",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-16876.json"
          }
        }
      ],
      "modified": "2026-10-20T10:47:47.973154969Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NUR3GMHQBMA3UC4PFMCK6GCLOQC4LQQC/",
        "https://github.com/lepture/mistune/blob/master/CHANGES.rst",
        "https://bugzilla.redhat.com/show_bug.cgi?id=1524596",
        "https://github.com/lepture/mistune/commit/5f06d724bc05580e7f203db2d4a4905fc1127f98"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:26:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "26"
                  },
                  {
                    "last_affected": "26"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2017-16876",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 379729,
  "published_at": "2017-12-29T15:29:00.61+00:00"
}