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xmldom CVE-2026-83613

| EUVDEUVD-2026-69231 HIGH
Inefficient Algorithmic Complexity (CWE-407)
2026-09-01 GitHub_M
Node.js Xmldom
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
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
vuln.today AI
7.5 HIGH

Network-delivered XML triggers the stall with no auth, no complexity, and no interaction; impact is pure availability with unchanged scope.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
Patch available
Sep 01, 2026 - 16:02 EUVD
Metadata Corrected
Sep 01, 2026 - 15:40 vuln.today
tag: Information Disclosure replaced by Denial Of Service
Source Code Evidence Fetched
Sep 01, 2026 - 15:07 vuln.today
Analysis Generated
Sep 01, 2026 - 15:07 vuln.today
CVE Published
Sep 01, 2026 - 14:38 cve.org
HIGH 8.7

DescriptionCVE.org

xmldom 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.

Articles & Coverage 2

News 4 New Node.js Vulnerabilities - 4 High Severity Sep 02, 2026 News 4 New Node.js Vulnerabilities - 4 High Severity Sep 01, 2026

AnalysisAI

Quadratic attribute-processing complexity in xmldom's DOMParser enables remote unauthenticated denial of service against any Node.js application that parses externally supplied XML. When a well-formed XML element contains many distinct attributes, DOMHandler.startElement repeatedly calls NamedNodeMap.setNamedItem, which in turn performs a full linear scan of previously inserted attributes on each insertion - producing O(N²) comparisons for N attributes and stalling the Node.js event loop before any application-level validation can execute. …

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Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation No special conditions are required beyond the target application using @xmldom/xmldom prior to 0.8.15/0.9.12 or any version of the legacy xmldom package to parse XML originating from attacker-controllable input. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 with vector AV:N/AC:L/AT:N/PR:N/UI:N/VA:H accurately characterizes the threat: no authentication, no configuration precondition, and no user interaction are required - any network path to an XML-consuming endpoint is sufficient. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation For @xmldom/xmldom users, upgrade to version 0.8.15 (0.8.x branch) or 0.9.12 (0.9.x branch), both confirmed released at https://github.com/xmldom/xmldom/releases/tag/0.8.15 and https://github.com/xmldom/xmldom/releases/tag/0.9.12; the fix replaces the O(N²) linear dedup scan with a null-prototype index at O(N) with byte-identical output. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit all Node.js applications to identify xmldom and @xmldom/xmldom versions in use across production and development environments. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Python 3 15 SP7 Not-Affected
SUSE Linux Enterprise Server 15 SP7 Not-Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected

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CVE-2026-83613 vulnerability details – vuln.today
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