xmldom: Quadratic-time attribute deduplication

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-83613
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 15:17:39 UTC
Updated2026-09-01 15:17:39 UTC
Descriptionxmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMHandler.startElement in lib/dom-parser.js inserts every parsed attribute through setAttributeNode, while NamedNodeMap.setNamedItem in lib/dom.js calls the linear getNamedItem or getNamedItemNS lookup for each insertion. A well-formed element with many distinct attributes therefore requires quadratic comparisons during DOMParser.parseFromString() and can stall a Node.js event loop before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-407 | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xmldom Xmldom affected <= 0.6.0 Not specified
CNA @xmldom Xmldom affected >= 0.9.0, < 0.9.12 Not specified
CNA @xmldom Xmldom affected >= 0.7.0, < 0.8.15 Not specified

References

ReferenceSourceLinkTags
github.com/xmldom/xmldom/pull/1071 [email protected] github.com
github.com/xmldom/xmldom/releases/tag/0.8.15 [email protected] github.com
github.com/xmldom/xmldom/security/advisories/GHSA-8344-3jmq-59r6 [email protected] github.com
github.com/xmldom/xmldom/pull/1072 [email protected] github.com
github.com/xmldom/xmldom/commit/cfb09b5dbeb035fdfedc9f01e2bbaf226bf47cf3 [email protected] github.com
github.com/xmldom/xmldom/releases/tag/0.9.12 [email protected] github.com
github.com/xmldom/xmldom/commit/2c548f200cfec991cd5846627ef8f03542309213 [email protected] github.com
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