CVE-2026-78661

UNKNOWN 0.0

Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	golang.org/x/net
Product	golang.org/x/net/html
Published	Oct 27, 2026

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Affected Versions

golang.org/x/net / golang.org/x/net/html

0 < 0.62.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/849365 go.dev: https://go.dev/issue/82224 groups.google.com: https://groups.google.com/g/golang-announce/c/sqrs2vTx_Xs pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6860

Credits

Markus Magnuson