CVE-2026-78661
Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net
- State
- Published
- Severity
- Not scored
- Published
- Oct 27, 2026
- Updated
- Oct 27, 2026
- Reserved
- Aug 24, 2026
Description
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.
Scores
The record has no CVSS score.
Weaknesses
The record names no weakness.
Affected Products
| Product | Versions |
|---|---|
golang.org/x/net/htmlgolang.org/x/net |
|
References
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