xmldom: Processing Instruction Target Injection Bypasses requireWellFormed

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-83616
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-01 15:17:40 UTC
Updated2026-09-01 16:17:27 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, Document.createProcessingInstruction(target, data) in lib/dom.js accepts an unvalidated target, while the requireWellFormed: true serializer checks only for a colon and the reserved case-insensitive xml name on 0.9.x and performs no target check on 0.8.x. Because serialization emits <?target data?>, a target containing >, ?, whitespace, or another invalid XML-name character can break the processing-instruction boundary and inject XML structure. 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:H/VA:N/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-91 | CWE-91 CWE-91: XML Injection (aka Blind XPath Injection)

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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:H/VA:N/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
High
Availability
None
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:H/VA:N/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 >= 0.7.0, < 0.8.15 Not specified
CNA @xmldom Xmldom affected >= 0.9.0, < 0.9.12 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/pull/1072 [email protected] github.com
github.com/xmldom/xmldom/commit/3b694872bcb5c7e3cbadba961a4be2488750ce5b [email protected] github.com
github.com/xmldom/xmldom/security/advisories/GHSA-c7q8-3ch8-vqpv 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/xmldom/xmldom/releases/tag/0.9.12 [email protected] github.com
github.com/xmldom/xmldom/commit/1cde3e31a07c41c87cfd368d6946aa477f16b4f9 [email protected] github.com
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