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CVE-2026-83612— xmldom: HTML raw-text closing-tag case mismatch causes output amplification

Quick assessment

Affected
xmldom xmldom
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

xmldom 是一个基于 W3C 标准（XML DOM 2级核心）的纯 JavaScript 实现的 DOMParser 和 XMLSerializer 模块。从 0.9.0-beta.1 到 0.9.12 版本中，通过 进行的 HTML 模式解析，在处理 、 、 或 这类原始文本元素的混合大小写结束标签时存在缺陷。 具体而言，由 或 选定的 函数使用了大小写敏感的 方法，并在结束标签缺失时（即 返回 -1 的情况）调用 ，导致解析器状态不稳定，并引发二次方级的输出放大效应。 因此，一个包含少量不可信内容的 文档在

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-83612

Vulnerability Information
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Vulnerability Title
xmldom: HTML raw-text closing-tag case mismatch causes output amplification
Source: CVE Program / CVE List V5
Vulnerability Description
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. From 0.9.0-beta.1 until 0.9.12, HTML-mode parsing through DOMParser.parseFromString() mishandles a mixed-case closing tag for the script, style, textarea, or title raw-text elements. parseHtmlSpecialContent, selected by isHTMLRawTextElement or isHTMLEscapableRawTextElement, uses a case-sensitive indexOf() and then calls substring() with a missing-close result of negative one, causing unstable parser progression and quadratic output amplification. A small untrusted text/html document can consequently consume disproportionate CPU and memory when parsed and serialized. This issue is fixed in @xmldom/xmldom version 0.9.12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
大小写敏感处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
xmldom xmldom >= 0.9.0-beta.1, < 0.9.12 -
@xmldom xmldom >= 0.9.0-beta.1, < 0.9.12 -

II. Public POCs for CVE-2026-83612

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-83612

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Other References for CVE-2026-83612 (4)

Same Patch Batch · xmldom · 2026-09-01 · 10 CVEs total

CVE-2026-83605 8.7 HIGH xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed
CVE-2026-83606 8.7 HIGH xmldom PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructi
CVE-2026-83607 8.7 HIGH xmldom: Element name injection via createElement() bypasses requireWellFormed
CVE-2026-83609 8.7 HIGH xmldom: Creation-time XML Name/QName validation is bypassable via an embedded line termina
CVE-2026-83613 8.7 HIGH xmldom: Quadratic-time attribute deduplication
CVE-2026-83614 8.7 HIGH xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartP
CVE-2026-83608 8.7 HIGH xmldom: DocType `name` Injection Bypasses requireWellFormed
CVE-2026-83611 6.9 MEDIUM xmldom: Parser silently accepts a not-well-formed end tag whose name is followed by a line
CVE-2026-83610 6.3 MEDIUM xmldom: XML fragment injection via invalid EntityReference.nodeName during requireWellForm

IV. Related Vulnerabilities

Same product: xmldom
Same vendor: xmldom
Same weakness: CWE-178

V. Comments for CVE-2026-83612

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