CVE-2026-78661

{
  "id": "CVE-2026-78661",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-27T22:18:05.930",
  "lastModified": "2026-10-27T22:18:05.930",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation (n.Data += text) reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags (such as \"a</x>\") caused O(n^2) allocations and byte copies. Accumulate coalesced text in per-node byte slices during parsing and materialize Data strings once at the end of parse."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "golang.org/x/net",
          "product": "golang.org/x/net/html",
          "defaultStatus": "unaffected",
          "collectionURL": "https://pkg.go.dev",
          "packageName": "golang.org/x/net/html",
          "programRoutines": [
            {
              "name": "parser.addText"
            },
            {
              "name": "parser.fosterParent"
            },
            {
              "name": "parser.parse"
            },
            {
              "name": "Parse"
            },
            {
              "name": "ParseFragment"
            },
            {
              "name": "ParseFragmentWithOptions"
            },
            {
              "name": "ParseWithOptions"
            }
          ],
          "versions": [
            {
              "version": "0",
              "lessThan": "0.62.0",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://go.dev/cl/849365",
      "source": "[email protected]"
    },
    {
      "url": "https://go.dev/issue/82224",
      "source": "[email protected]"
    },
    {
      "url": "https://groups.google.com/g/golang-announce/c/sqrs2vTx_Xs",
      "source": "[email protected]"
    },
    {
      "url": "https://pkg.go.dev/vuln/GO-2026-6860",
      "source": "[email protected]"
    }
  ]
}