HtmlSanitizer, htmlsanitizer — security advisory

{
  "id": "a9c5f08b41ae56f39ec43acfc79891f9ba80ba8da4a89960d6469ceb91d29488",
  "url": "https://osv.dev/vulnerability/ECHO-b56b-174c-3d1b",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ECHO-b56b-174c-3d1b",
    "summary": "ECHO-b56b-174c-3d1b",
    "evidence": "osv:ECHO-b56b-174c-3d1b",
    "products": [
      {
        "name": {
          "value": "htmlsanitizer",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "9.0.892",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "HtmlSanitizer",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "8.0.865+echo.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "ECHO-b56b-174c-3d1b",
      "aliases": [
        "ECHO-b56b-174c-3d1b"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "9.0.892"
                }
              ]
            }
          ],
          "package": {
            "name": "htmlsanitizer",
            "purl": "pkg:nuget/htmlsanitizer",
            "ecosystem": "Echo:NuGet"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-b56b-174c-3d1b.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8.0.865+echo.1"
                }
              ]
            }
          ],
          "package": {
            "name": "HtmlSanitizer",
            "purl": "pkg:nuget/HtmlSanitizer",
            "ecosystem": "Echo:NuGet"
          },
          "database_specific": {
            "source": "https://advisory.echohq.com/osv/ECHO-b56b-174c-3d1b.json"
          }
        }
      ],
      "modified": "2026-10-22T00:45:03.145014537Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-25543",
        "GHSA-j92c-7v7g-gj3f"
      ],
      "references": [
        "https://advisory.echohq.com/cve/CVE-2026-25543",
        "https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3f",
        "https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81",
        "https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/template",
        "https://github.com/mganss/HtmlSanitizer/releases/tag/v9.0.892",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25543",
        "https://www.nuget.org/packages/HtmlSanitizer/9.0.892",
        "https://www.nuget.org/packages/HtmlSanitizer/9.1.893-beta",
        "https://github.com/advisories/GHSA-j92c-7v7g-gj3f"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-25543",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 401185,
  "published_at": "2026-10-20T13:58:36.508+00:00"
}