GO-2026-6860unknown
Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net
The advisory, in context
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 packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
Semantic versions
Earlier releases before 0.62.0
Fixed in 0.62.0
View affected-version evidence
{
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.62.0"
}
],
"type": "SEMVER"
}
],
"versions": []
}