Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html

{
  "id": "b9afebbeaad8e902fb8d709ee842b036df851609a5f70518d8cf77d7b2b4a366",
  "url": "https://osv.dev/vulnerability/CVE-2026-25680",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Invoking denial of service when parsing arbitrary HTML in golang.org/x/net/html",
    "summary": "Parsing arbitrary HTML can consume excessive CPU time, possibly leading to denial of service.",
    "evidence": "osv:CVE-2026-25680",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-25680",
      "aliases": [
        "CVE-2026-25680",
        "GHSA-5cv4-jp36-h3mw",
        "GO-2026-5028"
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
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              "repo": "https://github.com/golang/net",
              "type": "GIT",
              "events": [
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                  "introduced": "0"
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                {
                  "fixed": "7770ec48d03fec35e378665337b4faca93c38423"
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            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25680.json"
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      "modified": "2026-10-28T02:30:50.709135586Z",
      "provider": "osv",
      "references": [
        "https://go.dev/cl/781702",
        "https://go.dev/issue/79573",
        "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
        "https://pkg.go.dev",
        "https://pkg.go.dev/vuln/GO-2026-5028",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25680.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25680"
      ],
      "provider_metadata": {
        "cna_assigner": "Go",
        "unresolved_ranges": [
          {
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              {
                "range": [
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                    "fixed": "0.55.0"
                  }
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                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25680.json"
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    "related_cves": [
      {
        "value": "CVE-2026-25680",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519437,
  "published_at": "2026-05-22T15:01:21.805+00:00"
}