{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/html",
          "product": "golang.org/x/net/html",
          "programRoutines": [
            {
              "name": "parser.addText"
            },
            {
              "name": "parser.fosterParent"
            },
            {
              "name": "parser.parse"
            },
            {
              "name": "Parse"
            },
            {
              "name": "ParseFragment"
            },
            {
              "name": "ParseFragmentWithOptions"
            },
            {
              "name": "ParseWithOptions"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.62.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Markus Magnuson"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode\u0027s 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\u003c/x\u003e\") 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."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-407: Inefficient Algorithmic Complexity",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-27T21:38:56.517Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/849365"
        },
        {
          "url": "https://go.dev/issue/82224"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/sqrs2vTx_Xs"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6860"
        }
      ],
      "title": "Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-78661",
    "datePublished": "2026-10-27T21:38:56.517Z",
    "dateReserved": "2026-08-24T23:36:15.738Z",
    "dateUpdated": "2026-10-27T21:38:56.517Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}