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xmldom EUVDEUVD-2026-69227

| CVE-2026-83612 HIGH
Improper Handling of Case Sensitivity (CWE-178)
2026-09-01 GitHub_M GHSA-6mj3-qw4j-hgrw
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-reachable with no complexity or auth required; impact is purely availability via resource exhaustion; no scope change, confidentiality, or integrity impact.

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

6
POC Analysis Generated
Sep 11, 2026 - 11:27 vuln.today
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 - 15:06 vuln.today
Analysis Generated
Sep 01, 2026 - 15:06 vuln.today
CVE Published
Sep 01, 2026 - 14:36 cve.org
HIGH 8.7

DescriptionCVE.org

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.

AnalysisAI

Quadratic CPU and memory exhaustion in @xmldom/xmldom 0.9.0-beta.1 through 0.9.11 allows denial-of-service via small crafted HTML documents passed to DOMParser.parseFromString(). The parseHtmlSpecialContent function uses a case-sensitive indexOf() to locate closing tags for raw-text elements; when a mixed-case tag like </ScRiPt> is not found, indexOf() returns -1, and the subsequent substring(-1) call destabilizes parser progression and triggers O(N²) output amplification. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target application passes attacker-controlled or attacker-influenced HTML content to DOMParser.parseFromString() with the text/html MIME type, using @xmldom/xmldom 0.9.0-beta.1 through 0.9.11. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N) reflects genuine network-reachable, unauthenticated availability impact with no exploitation complexity. … 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 Upgrade to @xmldom/xmldom version 0.9.12, which is the vendor-confirmed fix release available at https://github.com/xmldom/xmldom/releases/tag/0.9.12 and referenced in the security advisory at https://github.com/xmldom/xmldom/security/advisories/GHSA-6mj3-qw4j-hgrw. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Immediately (within 24 hours): scan all applications and dependencies for @xmldom/xmldom versions 0.9.0-beta.1 through 0.9.11 and inventory affected systems. …

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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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EUVD-2026-69227 vulnerability details – vuln.today

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