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CVE-2026-83606— xmldom PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructions

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 是一个纯 JavaScript 实现的模块，遵循 W3C 标准（XML DOM Level 2 Core），提供 DOMParser 和 XMLSerializer 功能。在 0.9.0-beta.9 到 0.9.11 版本中，lib/grammar.js 中的处理指令（processing-instruction）生成部分，其贪婪的 S+ 分隔符和懒惰的 Char*? 数据组，在缺少必需的关闭标记 时，会对较长的空白结尾部分进行反复重新划分。由于 parsePI 和 parseProcessingI

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-83606

Vulnerability Information
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Vulnerability Title
xmldom PI grammar regex ReDoS: quadratic backtracking on unterminated processing instructions
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.9 until 0.9.11, the processing-instruction production in lib/grammar.js lets the greedy S+ separator and lazy Char*? data group repeatedly repartition a long whitespace tail when the required closing ?> is absent. Both parsePI and parseProcessingInstruction apply the expression to the entire remaining source, causing quadratic backtracking during DOMParser.parseFromString() under default options and allowing a small unauthenticated XML input to stall the Node.js event loop. This issue is fixed in @xmldom/xmldom version 0.9.11.
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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
xmldom xmldom >= 0.9.0-beta.9, < 0.9.11 -
@xmldom xmldom >= 0.9.0-beta.9, < 0.9.11 -

II. Public POCs for CVE-2026-83606

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III. Intelligence Information for CVE-2026-83606

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Patches & Fixes for CVE-2026-83606 (2)

Vendor Advisories for CVE-2026-83606 (1)

Vendor Pages for CVE-2026-83606 (1)

Same Patch Batch · xmldom · 2026-09-01 · 15 CVEs total

CVE-2026-83605 8.7 HIGH xmldom: Attribute name injection via setAttribute() bypasses requireWellFormed
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-2026-83612 8.7 HIGH xmldom: HTML raw-text closing-tag case mismatch causes output amplification
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-2026-83617 8.7 HIGH xmldom: requireWellFormed element/attribute name validation is bypassable via an embedded
CVE-2026-83615 8.7 HIGH xmldom: Quadratic-memory consumption
CVE-2026-83619 8.7 HIGH xmldom: End-tag Whitespace-Trim Regex ReDoS — quadratic backtracking in the 0.8.x end-tag
CVE-2026-83618 8.7 HIGH xmldom: requireWellFormed DocType publicId/systemId validation is bypassable via an embedd
CVE-2026-83616 8.7 HIGH xmldom: Processing Instruction Target 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-400

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