{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-78661",
        "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "state": "PUBLISHED",
        "assignerShortName": "Go",
        "dateReserved": "2026-08-24T23:36:15.738Z",
        "datePublished": "2026-10-27T21:38:56.517Z",
        "dateUpdated": "2026-10-27T21:38:56.517Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
                "shortName": "Go",
                "dateUpdated": "2026-10-27T21:38:56.517Z"
            },
            "title": "Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net",
            "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": [
                {
                    "vendor": "golang.org/x/net",
                    "product": "golang.org/x/net/html",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "golang.org/x/net/html",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "0.62.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "programRoutines": [
                        {
                            "name": "parser.addText"
                        },
                        {
                            "name": "parser.fosterParent"
                        },
                        {
                            "name": "parser.parse"
                        },
                        {
                            "name": "Parse"
                        },
                        {
                            "name": "ParseFragment"
                        },
                        {
                            "name": "ParseFragmentWithOptions"
                        },
                        {
                            "name": "ParseWithOptions"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "CWE-407: Inefficient Algorithmic Complexity"
                        }
                    ]
                }
            ],
            "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"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Markus Magnuson"
                }
            ]
        }
    }
}