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: 2026-10-27
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
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Remediation

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History

Wed, 04 Nov 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-407
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 28 Oct 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang net
Vendors & Products Golang
Golang net

Tue, 27 Oct 2026 23:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770

Tue, 27 Oct 2026 21:45:00 +0000

Type Values Removed Values Added
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.
Title Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-11-04T16:40:30.972Z

Reserved: 2026-08-24T23:36:15.738Z

Link: CVE-2026-78661

cve-icon Vulnrichment

Updated: 2026-11-04T16:40:27.188Z

cve-icon NVD

Status : Deferred

Published: 2026-10-27T22:18:05.930

Modified: 2026-11-04T17:17:37.673

Link: CVE-2026-78661

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-04T19:15:14Z

Weaknesses