Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net
CVE-2026-78661 is fixed in golang-golang-x-net on 1 platform by DEBIAN-CVE-2026-78661 (version 1:0.62.0-1), released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| golang-golang-x-net · Debian 14 | 1:0.62.0-1 | DEBIAN-CVE-2026-78661 | Nov 3, 2026 |
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