CVE-2026-83608 (GCVE-0-2026-83608)
Vulnerability from cvelistv5 – Published: 2026-09-01 14:27 – Updated: 2026-09-01 14:27
VLAI
EPSS
VEX
Title
xmldom: DocType `name` Injection Bypasses requireWellFormed
Summary
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, the DOCUMENT_TYPE_NODE branch in lib/dom.js validates publicId, systemId, and internalSubset under requireWellFormed: true but emits DocumentType.name verbatim. A name containing > or whitespace can terminate the <!DOCTYPE ...> declaration and inject sibling markup; the value can be supplied through createDocumentType() on the 0.8.x and unscoped lines or through a direct DocumentType.name property write on every affected line. The default path and legacy creation-time behavior remain permissive, while the vulnerable strict path fails to enforce an XML Name. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Severity
CWE
- CWE-91 - XML Injection (aka Blind XPath Injection)
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/xmldom/xmldom/security/advisor… | x_refsource_CONFIRM |
| https://github.com/xmldom/xmldom/pull/1071 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/pull/1072 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/57aec90ac… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/85f12eb4d… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.8.15 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.9.12 | x_refsource_MISC |
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"product": "xmldom",
"vendor": "xmldom",
"versions": [
{
"status": "affected",
"version": "\u003c= 0.6.0"
}
]
},
{
"product": "xmldom",
"vendor": "@xmldom",
"versions": [
{
"status": "affected",
"version": "\u003e= 0.9.0, \u003c 0.9.12"
},
{
"status": "affected",
"version": "\u003e= 0.7.0, \u003c 0.8.15"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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, the DOCUMENT_TYPE_NODE branch in lib/dom.js validates publicId, systemId, and internalSubset under requireWellFormed: true but emits DocumentType.name verbatim. A name containing \u003e or whitespace can terminate the \u003c!DOCTYPE ...\u003e declaration and inject sibling markup; the value can be supplied through createDocumentType() on the 0.8.x and unscoped lines or through a direct DocumentType.name property write on every affected line. The default path and legacy creation-time behavior remain permissive, while the vulnerable strict path fails to enforce an XML Name. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "HIGH"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-91",
"description": "CWE-91: XML Injection (aka Blind XPath Injection)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-01T14:27:26.057Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/xmldom/xmldom/security/advisories/GHSA-27p8-2357-5qqv",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/xmldom/xmldom/security/advisories/GHSA-27p8-2357-5qqv"
},
{
"name": "https://github.com/xmldom/xmldom/pull/1071",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/xmldom/xmldom/pull/1071"
},
{
"name": "https://github.com/xmldom/xmldom/pull/1072",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/xmldom/xmldom/pull/1072"
},
{
"name": "https://github.com/xmldom/xmldom/commit/57aec90ac57b4408ae7c5d1746bf2a693b5ed90e",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/xmldom/xmldom/commit/57aec90ac57b4408ae7c5d1746bf2a693b5ed90e"
},
{
"name": "https://github.com/xmldom/xmldom/commit/85f12eb4d14b44de33216cfb72b50af4d24e9fdd",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/xmldom/xmldom/commit/85f12eb4d14b44de33216cfb72b50af4d24e9fdd"
},
{
"name": "https://github.com/xmldom/xmldom/releases/tag/0.8.15",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/xmldom/xmldom/releases/tag/0.8.15"
},
{
"name": "https://github.com/xmldom/xmldom/releases/tag/0.9.12",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/xmldom/xmldom/releases/tag/0.9.12"
}
],
"source": {
"advisory": "GHSA-27p8-2357-5qqv",
"discovery": "UNKNOWN"
},
"title": "xmldom: DocType `name` Injection Bypasses requireWellFormed"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-83608",
"datePublished": "2026-09-01T14:27:26.057Z",
"dateReserved": "2026-08-31T20:36:25.743Z",
"dateUpdated": "2026-09-01T14:27:26.057Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-83608\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-01T15:17:38.800\",\"lastModified\":\"2026-09-01T15:17:38.800\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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, the DOCUMENT_TYPE_NODE branch in lib/dom.js validates publicId, systemId, and internalSubset under requireWellFormed: true but emits DocumentType.name verbatim. A name containing \u003e or whitespace can terminate the \u003c!DOCTYPE ...\u003e declaration and inject sibling markup; the value can be supplied through createDocumentType() on the 0.8.x and unscoped lines or through a direct DocumentType.name property write on every affected line. The default path and legacy creation-time behavior remain permissive, while the vulnerable strict path fails to enforce an XML Name. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"xmldom\",\"product\":\"xmldom\",\"versions\":[{\"version\":\"\u003c= 0.6.0\",\"status\":\"affected\"}]},{\"vendor\":\"@xmldom\",\"product\":\"xmldom\",\"versions\":[{\"version\":\"\u003e= 0.9.0, \u003c 0.9.12\",\"status\":\"affected\"},{\"version\":\"\u003e= 0.7.0, \u003c 0.8.15\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"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\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-91\"}]}],\"references\":[{\"url\":\"https://github.com/xmldom/xmldom/commit/57aec90ac57b4408ae7c5d1746bf2a693b5ed90e\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/xmldom/xmldom/commit/85f12eb4d14b44de33216cfb72b50af4d24e9fdd\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/xmldom/xmldom/pull/1071\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/xmldom/xmldom/pull/1072\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/xmldom/xmldom/releases/tag/0.8.15\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/xmldom/xmldom/releases/tag/0.9.12\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/xmldom/xmldom/security/advisories/GHSA-27p8-2357-5qqv\",\"source\":\"security-advisories@github.com\"}]}}",
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-01T15:51:57+00:00",
"cve": "CVE-2026-83608",
"id": "CVE-2026-83608",
"initial_release_date": "2026-09-01T14:27:26.057000+00:00",
"product_status:known_affected": "26",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "xmldom: @xmldom/xmldom: xmldom: XML Markup Injection via DocType Name Bypass",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-83608.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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