{"identifier":"CVE-2026-78661","cve":{"id":"CVE-2026-78661","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.","published":"2026-10-27T22:18:05.930000+00:00","modified":"2026-10-28T15:24:56.033000+00:00","status":"Deferred","score":null,"severity":"UNSCORED","vector":"","cvss_version":"","affected":[],"weaknesses":[],"references":[{"url":"https://go.dev/cl/849365","source":"security@golang.org"},{"url":"https://go.dev/issue/82224","source":"security@golang.org"},{"url":"https://groups.google.com/g/golang-announce/c/sqrs2vTx_Xs","source":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2026-6860","source":"security@golang.org"}],"kev":null,"kev_checked":true,"metrics":{},"configurations":[],"source":"nvd","retrieved_at":"2026-10-28T17:25:50.912409+00:00","exploited":false,"kev_stale":false,"products":[],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00185,"percentile":0.08042,"date":"2026-10-29","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"go.dev","source_url":"https://go.dev/cl/849365","investigate_url":"https://investigate.aeglixmind.com/#go.dev"},{"domain":"groups.google.com","source_url":"https://groups.google.com/g/golang-announce/c/sqrs2vTx_Xs","investigate_url":"https://investigate.aeglixmind.com/#groups.google.com"},{"domain":"pkg.go.dev","source_url":"https://pkg.go.dev/vuln/GO-2026-6860","investigate_url":"https://investigate.aeglixmind.com/#pkg.go.dev"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-78661","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-78661","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-78661","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}